Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)
 15W-40 Heavy-Duty Diesel & Marine  Motor Oil (AME) Synthetic 15W40

Engineered for pre-2007 diesel engines in on-road applications as well as all model year diesel engines in off-road applications. High 12 TBN controls acids from combustion blow-by and EGR. Additives control soot thickening, oxidation and wear. Extended drain capabilities reduce downtime and motor oil expenses.
Package sizes include:

1-Quart Bottle
1-Gallon Bottle
2.5-Gallon Bottle
30-Gallon Drum
55-Gallon Drum

Product Code: AME • Brand: AMSOIL




MSDS Data Sheet French Data Sheet

Product Details Tech Data Reviews & RatingRelated Videos

Product Applications
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is engineered for use in a wide variety of light- and heavy-duty applications, including over-the-road trucks, off-road construction, marine engines, farm equipment, mining, industrial (pumps& generators) and personal automotive or commercial transportation. It is excellent for use with low- or high-sulfur diesel fuels in standard, turbocharged or supercharged engines, including diesels equipped with EGR systems.

AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is recommended for diesel engines, gasoline engines and other applications that require any of the following specifications:

Product Application Specs

• SAE 15W-40
• API CI-4+/CI-4/CH-4/CF/CF-2/SL/SJ
• ACEA A3/B3, E2, E3, E5, E7
• Global DHD-1
• JASO DH-1
• Mack EO-M, EO-N
• DDC 93K214
• Caterpillar ECF-1A, ECF-2
• Cummins CES 20076, 20077, 20078
• Volvo VDS-2, VDS-3
• MB 228.1, 228.3, 229.1
• MAN 271, 3275
• MTU Type II

Product Description
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is a premium diesel oil that provides excellent performance in all types of diesel engines where highly effective control of wear and deposits is vital. Engineered with heavy-duty dispersant/detergent additives, its Total Base Number (TBN) of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), varnish and sludge deposits. AMSOIL 15W-40 Diesel Oil resists heat and breakdown better than conventional petroleum oils for long-lasting performance and protection.

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL The First in Synthetics® to do the best job protecting your engine.

Extends Drain Intervals
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil can extend drain intervals far beyond those recommended for conventional petroleum oils. Its unique synthetic formulation and long-drain additive chemistry deliver maximum engine protection, cleanliness and performance over extended drain intervals, reducing vehicle maintenance and waste-oil disposal costs.

Advanced Soot and Wear Control Formula
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is heavily fortified with detergent/dispersant additives and is naturally resistant to soot. It is designed to keep soot particles suspended independently and prevent them from aggregating to form larger, wear-causing particles. Viscosity increase is minimized and soot-related wear is reduced.

Maximizes Fuel Economy, Reduces Oil Consumption and Emissions
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil has lower volatility than conventional petroleum oils. Oil consumption and emissions are minimized due to less vapor passing into the combustion chamber. Lower volatility helps AMSOIL 15W-40 Diesel Oil retain its viscosity after high-temperature service for continued dependable protection.

Excellent Cold Flow Properties
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil eases cold-weather starting (down to -44°F) and provides vital startup lubrication to help prevent engine wear. AMSOIL Synthetic Heavy Duty Diesel Oil outperforms conventional 15W-40 petroleum oils and minimizes the impact of cold-weather operation.

Below: Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

COMPATIBILITY
AMSOIL Synthetic Heavy Duty Diesel and Marine Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil life expectancy and reduce the performance benefits.

AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL motor oils.

SERVICE LIFE
AMSOIL Synthetic Heavy Duty Diesel and Marine Motor Oil is recommended for extended drain intervals in unmodified, mechanically-sound vehicles or equipment as follows:

Diesel Engine Service:
Three times (3X) OEM* recommendation, not to exceed 50,000 miles/600 hours or one year, whichever comes first. Drain intervals may be extended further with oil analysis.

Gasoline Engine Service:
Two times (2X) OEM* recommendation, not to exceed 15,000 miles or one year, whichever comes first.

*Operating conditions and drain intervals for severe and normal service are defined by the OEM. Refer to your owner’s manual.

Note: Extended drain intervals are not recommended when using biofuels containing >10% ethanol or 5% biodiesel (B5). Follow OEM drain intervals or extend drain intervals with oil analysis.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL AME.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
AMSOIL Synthetic SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil (AME)
Kinematic Viscosity @ 100°C, cSt (ASTM D445)14.5
Kinematic Viscosity @ 40°C, cSt (ASTM D445)98.4
Viscosity Index (ASTM D2270)153
CCS Viscosity @ -20°C, cP (ASTM D5293)4892
Pour Point °C (°F) (ASTM D97)-40 (-40)
Flash Point °C (°F) (ASTM D92)240 (464)
Fire Point °C (°F) (ASTM D92)250 (482)
Four Ball Wear Test (ASTM D4172: 40kg, 75°C, 1200 rpm, 1 hour), Scar, mm0.35
Noack Volatility, % weight loss (g/100g) (ASTM D5800)6.6
High Temperature/High Shear Viscosity
(ASTM D5481 @ 150°C, 1.0 X 106 s.-1, cP
4.22
Total Base Number12.1

Diesel Power Challenge

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Product Name: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)
Current Rating: 4.88 out of 5 stars
Total Votes: 142 vote(s)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Eric: space

Will continue to buy

Use it on both of my 7.3s love it

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Moomoo: space

Like this product used it for longtime

Great product about some it up used it four years. Not only use 14-40 in my 2003 dodge i use amsoil in all my stuff

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Smoke: space

Good stuff

Are used this product on four different trucks since 2007 to my current 2016 Duramax diesel I would not use any other oil

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hhdreamer: space

Awesome oil!

I am so thankful that Amsoil still makes this oil. I use it in my diesel farm equipment and truck that I don't want to use the disasterous CJ class of oils!!!

Thank you Amsoil!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Horseman: space

Been using AMSOIL since 2005

Been using in my 1999 F250 diesel since I bought it in 2005 with 57K miles. Engine now has 227,000 miles and still runs smooth and burns very little oil . I learned when I bought my truck that the fuel injectors are lubricated with the engine oil and I wanted the very best oil in my engine. I have had to replace only one fuel injector to this date.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by E man: space

I would buy this product again

Get a lot more mile from this oil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jerry: space

Again

Tractor

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by rob: space

will contune buying

this motor oil ,i got no comment to say ,the fluid is great, the antiwear formulars that is blended in is good and it do not burn within oil change inteval,i normally replace every 20,000 to 25000 miles on the ram with the 6.7 diesel.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Perfered Customer 99: space

Diesel oil review

Been using this oil since I have had 25,000 miles on my 05 duramax now have 128,000 plus miles and it still going strong. Now I don't put as many miles on the truck and I only have to change the oil once a year. Also use AMSOIL filters.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Morgan: space

I will always buy this product

I change my oil every 10-20k in my 99 cummins. Its still gold in colour after 5k.i proudly show everyone

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by pf250: space

Only oil I use in my SD 7.3L

I pull a 38 ft 5th wheel. The oil gives me the extra miles I wanted between oil changes. I have Gained over a mile per gallon in millage after switching to AMSOIL

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TJ: space

I have used this product for 5 years and it is the best oil

change oil once per year after about 50 hours of operation

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by luke: space

Trust worthy quality product

Use in my work truck that is constantly pulling equipment .

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg: space

Used this for 10 Years

I run this in my 03 Cummins 5.9. Great oil, have 356,000 on her.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rod: space

Great stuff

Duramax diesel

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Duramax: space

Pretty good

Put in an 07 duramax fully deleted great
Put In a 13 duramax fully deleted typewriter ticks slightly
Put in a 2015 duramax fully deleted typewriter ticks really bad

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chief: space

I have purchased this product since my bought my Dodge trk,

Recommended by a friend, I have purchased this product since I bought my 2004 Dodge Heavy Duty. Still runs great. I run Donaldson oil filter.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stan the man: space

Amsoil for the big rig

I use Amsoil products in all my vehicles

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doc: space

have purchased this product repeatedly

I use this particular product in both my diesel powered Motor home, and my F350 truck. I used oil testing to determine oil change periods and have saved considerable money over fossil based oils. In addition easier starts, and increased mileage have added to the positive results of the AMSOIL use

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Keith: space

Still using

Been using in 06 chevy 3500 has 253,000 uses a qt, in 25000 miles can't complain !

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Continues to perform the best.

Been using this for years and have been validated time and time again. This is the best!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big John: space

No oil close to this product

Run it in both of my duramax trucks one has 260 thousand miles other one Amsoil is all it's ever had both all clean as gold

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MIXER FIXER: space

TRUST YOURSELF AND USE AMSOIL PRODUCTS

ALL MY CARS AND RV USE AMSOIL OIL AND FILTERS AND HAVE NOT HAD ANY ISSUES USING THEM. ALL RUN COOLER AND SMOOTHER. THE ONLY OIL I WIL USE. ALSO USE ALL THERE OTHER PRODUCTS TOO.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jim: space

Get the most out of your oil!

I tried this oil the first time I ran it for 14,000 miles it test still good. The second time I ran it 19,000 miles, it still tested good. I may change the filter at 20,000 and go for 25,000 this time we will see how it goes. I think my Duramax likes it too!!!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by B-: space

Grwat product

Excellent oil!! Performs just like all Amsoil products do.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Silver Bullet: space

I would buy this product again

Run this oil in my 8000# open diesel truck. it has been ran in this truck from the time it was new.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Verno: space

Excellent product

Use Amsoil 15W40 in my 82 VW Westfalia and would have anything else. Just returned from a coast to coast trip (12500 miles in total, mountains, snow, heat and lots of cold starts and the old van never let us down. Credit to Amsoil!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JRT: space

Amazing products

I run the 15w-40 diesel/marine oil in my 99 Peterbilt. I've had excellent like with it for 3 years now and the extended drain intervals save me a lot of money per year.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ZH: space

Oil that makes engines last a lifetime

I have been running this oil for seven years. I ran it in a fleet of 125 Generators, 25 Loaders, and 40 Kenworth semis. I never once in 3 years had an engine failure. These pieces of equipment ran around the clock in the oil fields. Our generators would run 26,000 Hours before we would bring them in for a rebuild. We would take them out of service for a rebuild, the engines never failed. I would reccomend this product to anyone and I would put it against any other oil on the market. I run it in all my personal vehicles and engines. I will be an amsoil customer for life.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Runky: space

Best for my diesel

I've used this oil in my diesel pick up since I bought it in 2005. It's had 11 oil changes in 11 years and 142000 miles and runs great. All the fluids in my vehicles are Amsoil products. Stick with the best.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brad: space

Will buy again

2002 duramax lb7, works great

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robert: space

SAE 15w-40 heavy duty diesel and marine oil

Great product. Run nothing but Amzoil in all vehicles including off road vehicles and boat

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Toon: space

Have used this for years

Have used this for years in my trucks .

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Art: space

Great

Love this oil. Why don't you guys send stickers anymore?

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sfa: space

OIL

This is the best oil that I've found for my duramax

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Frank: space

Great product

I have used this product in my 05 chev duramax for years. My truck has 155000 miles and I'm sure the oil has a lot to do with it

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mini me: space

Jove this oil

I use this oil In my dmax

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cruiser: space

Will always use This in every diesel truck I'll own

Bought the 2012 Ram 3500 18 months ago. Didn't know what oil the previous owner used but took the truck home. Changed oil to amsoil 15-40 at 22000 miles. I currently have 90000 on the truck and performs great. I also pull a 39 ft 5th wheel

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charlie: space

The only oil I use

Love the extended drain cycles. I ran my truck for 10,000 miles before I drained it. Next time I will do an oil analysis to see if I can go longer

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big Gold: space

Towing in the Rocky Mountains

The reason I went with Amsoil was because I tow heavy up the mountains and wanted a full synthetic that I knew I could depend on. This full synthetic 15w-40 does everything I need it to. Keeps my engine running like new and I only have to change it every 10,000 miles. Awesome job, you definitely have a lifetime customer!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chris: space

Best oil a serious motorist can ask for.

Amsoil is the best synthetic motor oil I have used period. I use this in all my trucks and equipment and with very high miles and high hours. Each and everyone operates excellent.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joey: space

5.9 Cummins

I have been using Amsoil Diesel marine oil for over 10 years on my 2004 Dodge common rail I have no complaints for the price I pay for....(You get what you pay for) Good product no leaks,overheating,knocking or any issues with oil. 123,000 miles and going strong.....Even my diffs and trans use Amsoil...

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

I believe in this oil.

This is a fantastic oil. I love the fact my oil change intervals are longer. I have been using this for many years. Almost have 200,000 miles on my 7.3 liter and its still going strong.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Casey: space

Love this product

Drive a lot this product seems to help truck run smoother

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Decent: space

AMSOIL is truly the best real Synthetic oil out there.

AMSOIL is truly the best real Synthetic oil out there and i will not use any other oil for my trucks and cars. Thank You AMSOIL for standing by your product and so do I !

Kevin Broyles

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Capt. Cocomojo: space

Until amsoil makes something better

Run my offshore boats Hard, keep them at running for hours at 5500 rpm.
My custom built diesel truck tows all over the country carrying heavy loads.
Run the Marine amsoil in both.
Blew a coolant hose pulling my offshore boat from Bodega bay , ran for 27 miles with no coolant till I got home. Diesel never once thought about overheating.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Great oil

Used for years in truck.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mellow Yellow: space

This Oil is the best oil for my particular circumstances

I have a 1982 Diesel Westfalia with a 1.9TD engine. I am almost scared to try another brand and definitely never another grade of Oil. I did that because at the time I was on vacation and I couldn't find the Amsoil product. Within one tankful of diesel I lost my turbo. Also, I also cannot find any other reason for my decreased mileage when I did switch brands. I admit I am a bit anal about my old Westy but with careful, consistent driving I can resolve all the variables. Despite the difficulty in finding a local supplier and the increased expense verses using a local sourced brand I will always choose Amsoil brand. Having gone through 3 engines from other causes, it's just not worth the risk to switch.
Thank you Amsoil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Don't have one: space

Why would't you?

I have been using these products for many years in gasoline and diesel applications. Big plus is the ability to set and forget for a year is quite nice. With having multiple vehicles in my driveway and having to work on many others means my maintenance needs to be transparent to all of the other work. This product in particular has kept my engine safe and worry free. My truck is from the showroom floor in 2003 (6.0l) and she is not allowed into the shop accept for programming or tires. Those are my rules as well as for all the rest in my driveway. I will not accept inferior products. Thank you Amsoil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by TJ: space

Diesel Oil

My 1996 Ford F-250, 7.3 Powerstroke never leaked oil until I started using this product. Only 137000 miles.
Works well in inboard boat engine.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Montague Wrangler: space

Best oil you can buy

In my diesel truck I have tested my oil using the AMSOIL filter after 15000 miles and it always tested good and ready dfor additional mileage.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big A: space

Great diesel engine oil

I have been using this in my 5.9 Cummins for four years now. I gained 2 mpg since changing all of the fluids over to Amsoil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andy: space

I will keep using this product in every machine I own

I really like this oil. I was using Rotella and burning a gallon every 2 weeks. Since I switched I don't add any oil throughout the 500 hour service. I also get better fuel mileage. I was averaging around 4.8-5 now I average 5.5-5.8

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Boog: space

Yes

I have used amsoil for years . It's the best & has always improved on its products.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by muxdragon: space

Great Product, would buy it again!

Lasts a full year before the next oil change. I like the 2.5 Gallon jugs the best. Great product!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ANITA: space

Definitely continue using it.

We use in 95 Freightliner. We have been using for 4 years or more.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ric: space

I will purchase this product again

After 500 miles, the oil is still honey colored, not black like the other oils I have used. This oil is great.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Works great

Been using this for 10 years now and never had any trouble. Great protection and better in cold winter starts

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rabbit: space

Absolutely great

I have used this oil from my first oil change at 5,000 miles with Amsoil absolute filters. Test oil at 25000miles change filter and run another 10000 miles. Tests have all came back with no viscosity breakdown, no metals or any other abnormalities. I now have 160,000 miles and have never had to add any oil other than what it takes to fill the filter. The service is second to none and so are Amsoil products.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

My oil

Love Amsoil and it's reliability

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jose: space

I BUY AGAIN

I BEAM USE THIS PRODUCT FOR MY DIESEL TRUCK NICE PRODUCT

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gennaro: space

I will continue to buy this oil,and recommend it everyone

I use this product in my 28 carolina classic with 2 4bcummins diesel engines. the oil has kept the engines clean and running smooth, with no smoke. the engines have 1300 hours on them.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Keith: space

Amsoil well worth the price

Exceeds expectations. Ordinarily, when I used other motor oils discoloration takes place within 1 to 2000 miles. Thus far since I switched to Amsoil, 3000 miles, no discoloration and no oil consumption.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kyle: space

Will purchase again.

This is the best and only oil for my powerstroke.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stephan: space

Will use again

A great heavy duty diesel oil with high 12 total base number. Works great , quiet's engine noise, keeps good oil pressure and engine clean.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stephan: space

Great oil for older hard running diesels.

Runs great in my old diesel and my new one!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andriy: space

Yes

555

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

yes buy again

Performs as expected but on the pricey side.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ted: space

yes, I will keep buying it

use it in my dodge truck, very pleased

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robert: space

I intend to keep using this product again

Use it in my Duremax 350,000 on it does not use a drop of oil between changes.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jagath: space

Only use AMSOIL

I use it on my Ram 2500 with 5.9 Cummins engine and it's humming and I use the 1 micron bypass filter

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Darren: space

I would buy this product again.

I have used this oil in my 2006 Duramax since it's had 10,000 miles on it.
I currently have 123,000 miles on it and no problems..

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg: space

I would buy this product again

I have been using this product in my diesel pick up for years now. 360,000 miles and going strong.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doug: space

Have used this product for several years.

Could tell the difference the first time I changed to this oil. The truck runs smoother and uses very little between changes.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

Highly recommend.

Love this oil for my '05 Duramax.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jimmie: space

I will continue with this product.

Used AMSOIL in '97 F250 - ran great for the 15 years I had it hauling horses to shows across the country for 250k miles. Replaced this truck with '06 F350 in 2013 - not hauling as much or as far but still trusting AMSOIL.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by WILLIAM: space

Dodge Ram 2500

Best oil for my Dodge Ram 2500 5.9 Diesel.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

205K still like new

I have used this oil since the very first oil change on my 04 Chevy Duramax. At 205K they pulled the valve covers to change out the injectors and it still looked factory new. No discoloration of the rocker arms or any build up. Just like new. Best thing I've ever done for my vehicles.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Anthony: space

change oil sticker

first time user for older cummins 5.9 hope it holds up to claims only thing i would ask for when purchasing amzoil is giving a sticker for window to right next oil change on

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Daniel: space

Excellent, I recommend in top of all

I used this oil in my Sea Ray Sundancer whit 350 Mercruiser for 4 years and the Gear lube swell

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

I will continue to use this product

Have 395,000 miles on a 1999 Ford F-250 7.3 diesel did compression test at 380,000 was 3 cylinders at 410 rest at 420 change my oil every 10,000 it can only be the oil that caused such longevity.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dietter: space

I would buy this product againe.

Use this on my F250 6.0 last couple of years (220000miles)

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Eric: space

I will buy this again.

Great oil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Britman: space

Will buy again and again

Great product to keep your engine running at it's peak performance. Used it in my 2006 Dodge Ram 2500 for 152,000 miles. Plan to use in my new Ram 2500.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Smitty: space

Not the highest rating

My vehicle has 245,000 miles using this product plus others and I am pleased with all of them.
However, my rating of four stars is because you need to continue to produce quality products, stick to your excellent lab testing, research, upgrades and improvements, while keeping affordable prices. When you think you have accomplished all this I will change my rating to five stars.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rick: space

Service Intervals greatly reduced

By switching to Amsoil i have seen better gas mileage and i don't have to worry about changing my oil while on the road snowbirding . I just change once a year now and still get better lubrication on my new Ram .

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by KT: space

Awesome Diesel Oil!!!

Love Amsoil! Use it on my vehicle and all my equipment. #1

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bullitt 47: space

2007 Chevy pick-up truck.

I have used Amsoil products in my truck since it had 20,000 miles on it. I used the 15-49 heavy duty and marine oil in the engine and Amsoil transmission fluid. The differential oil was drained and Amsoil gear oil was used.
The truck just turned 150,000 miles. I can honestly say that I have not experienced any problems with any of these components. The truck was used for most of it's miles for towing a 5th wheel camper around the country, until 3 years ago. The transmission ran cool and very efficiently. The differential, runs quietly and smoothly. The engine, runs like new. I have had to replace the glow plugs, which is normal maintenance, otherwise, the engine runs like new and maintains the power that it had when new.
I recently replaced the engine oil in our diesel motor home, and expect the same results.
Extended oil changes, makes it possible to travel longer distances without the inconvenience of stopping for oil changes. That saves a lot of time and ends in less expense. I'll soon be replacing the transmission fluid to Amsoil fluid as well.
Great products, with more confidence, less worry about break downs and less expense. Couldn't ask for more.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

This is the only oil i will ever use.

I use this oil in my truck

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg: space

The best oil anyone can buy

I own a 2002 Ford F-250 with a 7.3 diesel with 354,000 miles on it. I have been using Amsoil diesel and marine oil for over 200,000 miles engine is running fine with very little oil consumption. Ialso have Amsoil
products in the transmission and differentials. I also use Amsoil products in my 4-stroke outboard motor. I'm
sold on Amsoil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tc: space

Diesel synthetic oil

Truck is much quieter with full synthetic. Also starts much easier in cold weather. Using amsoil in truck for 2 years and have since been using in all my vehicles with no complaints

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ray: space

repeat buyer

Years ago, I had bought a used commercial wood chipper from a gentleman in Pennsylvania. He was formerly a Navy mechanic now retired. He told me he always used Amsoil and recommended it highly to be used in the chipper. Fast forward 6 years and we are still using Amsoil in all our machinery, trucks, backhoes, tractors, lifts etc. Need I say more?
Loyal Customer from New York state
Ray H

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rocky: space

I have and will continue to buy this product.

I have been using 15W-40 Heavy-Duty Diesel Oil in my 2004 F-350 Diesel truck for the last several years. I also use Amsoil filters. I change both once a year and everything is fine with my truck. The ordering and delivery cannot be any easier. The price and advantage of only needed to do both once a year cannot be underestimated.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by duke: space

Exelent Oil Highly recomended

highly recommended

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chris: space

Top notch product

I use this product in a 7.3 liter Powerstroke diesel engine. The formula works very well in my application - and the extended drain interval provided by oil analysis adds value to the protection.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pete: space

I do intend to repurchase this item again

I use it in my 2004 Chev that has a 6.6l diesel

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Denman: space

I buy this product every year

Like product and use each year. Combined with bypass oil filter I change once a year. Oil sample sent in said oil still had lots of life left in it.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

Works well as far as I can tell

I have used this in 2 of my 7.3 Powerstrokes, and have not had any lubrication problems.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by banjo fred: space

sae 15w-40 heavy-duty diesel and marine oil

great product outlasts and out performs any oil i have ever used,i am a full-time rv er i pull a 5th wheel and boat from central il to the rio grande valley with a swing through eastern ky and back every year

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ray: space

15W-40 HD diesel oil

I change The oil Every 10,000 miles And when I send In the oil samples They always come back good. Have not had a need to change oil come back yet. For my diesel I would not run anything else.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robo: space

SAE 15-40 Heavy-Duty Diesel and Marine Oil and a 2004 Dodge

I have owned my Dodge Cummins Diesel Truck since new.
After the initial break-in, it has had nothing but Amsoil 15w-40 Heavy Duty Diesel and Marine Oil; and changed once a year; along with an Amsoil oil filter.
345,000 miles later should speak for itself.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Plattoon: space

Best on the market!

Been using it for 15 years . One of my old trucks which I sold to a friend after putting 100000 Amsoil miles on it now has over 300000 miles on it now. I used Amsoil in my race vehicles. Engine, diff ,transmission , brakes, grease...... Without ever having a failure. Great product.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Turtle: space

High quality synthetic oil

I use this motor oil in a 2002 Ford Powerstroke 7.3 liter diesel E350 van equipped with Amsoil's dual oil filter system. With recommended filter change intervals, add-back oil, and regular oil analysis, I have yet to reach a point where I needed a complete oil drain and replacement. This system has saved me money and time and has provided great peace of mind. Plus it is very environmentally friendly because the old system using petroleum oil required disposing of 15 quarts of dirty, used oil every 3-5,000 miles.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Great product. Needs one thing...

Would love to see an oil viscosity test kit with purchase of 25,000 mile filter. While I've used your product a lot, it's nice to see the results at the time of next oil change

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big nasty: space

I'll be buying again soon

Cheaper and holds up better than royal purple

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by ans56: space

Best protection for new or older vehicles

I have used 15W-40 Heavy Duty Diesel and Marine Oil in all my diesel and heavy equipment. Amzoil has a fine product that can not be beat!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dirty D: space

Best oil period!

Filled my 700 horse cummins and she purrs like a kitten. Sitting at 95000 miles since the build up and still smooth quiet idle and fantastic oil life. Would fully recommend this oil to anybody seeking simply the best!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Nick 0311: space

Love AMSOIL products

Recently purchased 4 gallons for my 7.3 powerstroke & join the preferred customer program, couldn't be happier with my choice.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Travelworker: space

Reliable oil

Bought my diesel in 2004 brand new & put amsoil in when it just had 800 miles. Everybody said I should wait till all the seals broke in. Still have the truck 12 years later 131,000 miles no leaks & still use amsoil.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gibby: space

I will buy again

I use it in my older trucks one truck I bought used and replaced a rusted oil pan the motor was full of sludge. They ordered the wrong oil pan but need the truck so made it work for short time.it was on for maybe 1 and half months then changed to the right on. When I took it off the second time it looked like the motor was brand new I could see my reflection excellent product would recommend to everyone that can use it in there application

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JasperFlash: space

Great product and long engine life

I have a 2002 F350 4 wheel drive 7.3 liter . I changed from regular oil to Amzoil at 10,000 miles . It now has 253,000 on it and no engine trouble that I attribute to Amzoil. It will last a lifetime using this oil . Had the valve covers pulled at 150,000 miles and there was no sludge buildup whatsoever. Can't say enough about this great product! If manufacturers would use this oil they would go broke because engines would last a lifetime!

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

SAE 15W-40 Heavy-Duty Diesel and Marine Oil

I have been using AMSOIL for years in my F350 Ford 7.3 diesel engine and never had any problems, and I love all the money I have saved over these years. I also use AMSOIL oil filter with each oil change. I am so pleased with AMSOIL products I be came a "Preferred Customer" and now planning to become a dealer.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Roger's GMC Diesel: space

Been Great for My GMC for over 13 years!

I started using Amsoil for my GMC Diesel in 2003 shortly after purchasing it. Works great and runs longer than the normal oil I had used on vehicles previously. My truck pulls horse trailers and is running great with over 230k miles and growing.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Farmer Bob: space

Only product I buy for my diesel's

I am a farmer and work my equipment hard and need the best of everything for the equipment so I get the most out of them and best performance.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jack: space

AMS oil

I am a long time customer with AMS oil, and highly recommend this product to everybody ,

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bean: space

Considering the price of new trucks.

When I buy amsoil I know that it's the best. Don't even consider anything else. Been using it for 30 years not a problem with this oil. Kind of pricey but I know that it won't let me down.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tapage: space

Nice to have an option for old Toyota Diesel engines.

I'm using this one, very pleased on my 1HD-T DI diesel Toyota engine .. which it's old school turbo diesel ..

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hank: space

I would use this again

Great oil use it always

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Diesel Daryl: space

I only use this oil.

2005 Dodge 3500 5.9 Cummins. 222391 miles only oil used since first oil change. I pull 12000 lbs. trailer everywhere .

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by RAT454: space

SAE 15W-40 HEAVY DUTY

Have 346000 on my 03 Dodge Ram Cummins. all ever ran in it.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

Yes I'm use this product for the last 8 years

Best oil ever,I'm very happy with the product

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Genny man: space

I will keep buying this product.

I've been using this oil.for approximately 15 years in my 17 yr old truck.The oil is still gold in colour after three thousand miles

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jerry from Madera: space

Built Ford tough!

I use Amsoil engine lubricants and other products in all my vehicles. The Ford diesel has been a real workhorse, taking me on numerous trips ranging from literally the equivalent distance from Paris France to Moscow Russia and back! Plus along desert trails that had my buddy grabbing the dash and asking "THIS is the road!"

Amsoil heavy duty diesel & marine oil "had my back" on such trips.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dr. Bill: space

Works

Hard to leave a review on something you can't see working. But been using it in my diesel truck for 10yrs. If anything, shipping could be a little less but the product is great.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Twilson: space

Amsoil Diesel and Marine 15w 40 synthetic

I recently switched my old chevy 2500hd duramax diesel to Amsoil's heavy duty diesel and marine 15w 40 synthetic diesel engine oil. I switched to Amsoil mainly because I heard in my years of being a diesel technician that amsoil has made an outstanding product. So I decided to run it in my pickup. I ran it for 1 oil change of 5,000 miles which I know is way less than the 25k they recommend but I was skeptical of a 25k mile oil change on a 250k mile farm truck. So I dropped the oil a 5k and sent in a sample and I got my results back saying that my pickup is in like new condition and that i was wasting my money changing my oil too often. They said the amsoil additives we're among the beet in any synthetic oil and my pickup was running clean with almost no soot in the oil. So I would recommend amsoil to any potential customer that just needs the nudge to try it. Don't worry because you won't regret it.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mr. Wilson: space

Excellent performance

I have two Ford F-250 trucks, a 1999 and 2000. Both have 7.3 Diesel engines. Using EA extended life oil filters along with this oil, I change the oil once a year and the oil looks like the day I first changed it. It is the BEST oil I have ever used. I now use AMSOIL products in all my equipment.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Frenchy: space

Again and again....for years past to uncoming

This oil addresses one of big rig o/o life's saddest complexities (break downs) with such sweet simplicity. ..
Extended oil change (cat 3406E) thus cheaper even in short term (I do 45k between oil changes )do the math !! 1.9 million miles later and running strong and fast...

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)

Reviewed by Michael William: space

High total base number = long service life

After installing the Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME) in our 2006 international trailer we have extended drain intervals by more than 3 times with the help of periodic used oil analysis.

Each time the report comes back recommending for continued use. At this drain interval, it costs less than half regular oil.

Also our logs shows 8% lower fuel consumption for the same distance compared to regular oil, so this actually puts money back into our business in fuel savings.

Item Reviewed: Synthetic Heavy-Duty Diesel & Marine Motor Oil SAE 15W-40 (AME)
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