AMSOIL Beats the Competition with its lower cost Heavy-Duty Synthetic Diesel Oil 15W-40

Upgrade from Rotella and all the others and feel the difference!

Formulated for Exceptional Diesel Engine Protection

1Based on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation.

2.5 Gallon Amsoil Diesel oil jug

AMSOIL Heavy-Duty Synthetic Diesel Oil is formulated for hardworking equipment. It is engineered to provide 4X better wear protection1, giving you the edge to keep trucks and equipment operating at peak performance. Heavy-Duty Synthetic Diesel Oil offers outstanding value and provides excellent protection for customers seeking an upgrade over conventional, synthetic-blend or competing synthetic diesel oils.

Heavy-Duty Engine Protection
Wear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Independent testing shows

AMSOIL Heavy-Duty Synthetic Diesel Oil delivers 4X more wear protection1 to help maximize equipment life and reduce maintenance costs and downtime.

Ordering: When you add this to your cart check out the per quart price when you buy the 12-quart case or 4-gallon case. Case lots save another 5-8%. And a s a preferred customer add another 25% to that!

Buy & Check Price& Bottle Sizes

 

Call 800-579-0580 for competitive current price.
Or use the online preferred customer portal if you choose to order online.

Printable Product Data Sheet for Heavy-Duty Synthetic Diesel Oil 15W-40.

Download PDFProduct Datasheet Vehicle Look-up: Match AMSOIL Products to your model

Found this cool old video! I remember when it was played at the AMSOIL dealer convention at the time. So much has improved since then but we were still ahead of the diesel oil game.

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Viscosity Control

Formulated with advanced synthetic base oils and detergent/dispersant additives, AMSOIL Heavy-Duty Synthetic Diesel Oil minimizes viscosity change while keeping soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Lower volatility also helps Heavy-Duty Synthetic Diesel Oil retain its viscosity after high-temperature service for added engine protection and increased fuel economy.

Excels in Extreme Temperatures

AMSOIL Heavy-Duty Synthetic Diesel Oil is formulated to deliver improved heat and oxidation resistance compared to conventional diesel oils. It provides clean engine operation and helps maintain power and fuel efficiency for superior engine performance. AMSOIL Heavy-Duty Synthetic Diesel Oil also flows dependably in cold temperatures for easier startup and improved engine protection.

Minimizes Oil Consumption

AMSOIL Heavy-Duty Synthetic Diesel Oil has a low rate of volatility (burn-off), reducing oil consumption during operation and passing less oil vapor into the combustion chamber. It provides up to 66 percent less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.

Advantages - Lower Oil consumption with Amsoil diesel oils
Lower oil consumption alone is why you need Amsoil Diesel oils

Heavy-Duty Diesel APPLICATIONS

Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:

  • API CK-4, CJ-4, CI-4+, CF
  • Volvo VDS4.5, VDS4, VDS3
  • Mack EOS-4.5, EO-O
  • Renault RLD-4, RLD-3
  • Cummins CES20086, CES20081
  • Caterpillar ECF-2, ECF-3, ECF-1-a
  • DDC 93K218, 93K215, 93K214
  • DFS 93K222
  • ACEA E9, E7
  • MB 228.31
  • MAN 3575
  • MTU Type 2.1, II, I
  • JASO DH-2
  • Deutz DQC III-10LA
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Allison TES439

All viscosities capable of gasoline service API SN; consult owner’s manual for proper viscosity recommendation.

COMPATIBILITY

AMSOIL Heavy-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will reduce the performance benefits.

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

SERVICE LIFE

AMSOIL Heavy-Duty Synthetic Diesel Oil is recommended for the drain intervals stated by the original equipment manufacturer (OEM). Refer to the owner’s manual for the specific oil change interval. Intervals may be extended beyond the OEM-recommended interval with oil analysis. Provides lasting protection for multiple events during competition. Use oil analysis to determine appropriate drain interval for competition use or when extending drain intervals beyond the OEM recommendation.

Dealer note: Average feedback from our light-duty pickups using them in their business for towing/hauling, this oil is easily reaching 9000 to 12,000 with a good analysis score. That said there are several factors which can effect the life of the oil but proper air and oil filtration are key. I recommend trying your own oil analysis to benchmark service intervals and the wear situation of your engine.

Save 25%Join for More Perks Preferred customer Program

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HEALTH & SAFETY

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). An SDS is available online at www.amsoil.com or upon request at 715-392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

AMSOIL PRODUCT WARRANTY

AMSOIL products are backed by a Limited Liability Warranty. For complete information visit www.amsoil.com/warranty.aspx.

* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Customer Comments on AMSOIL’s 2nd Best Diesel Oil line.

A 2nd tier oil of AMSOIL yet still beats all the others!

 

I love this stuff, it really holds up

By  MILES,  a  Verified Buyer  from  South Carolina, USA  on  February 13, 2025
I really do swear by amsoil, their fluids hold up and definitely are worth it. Id run mobil delvac in my LBZ Duramax for many years but it just seemed like itd never hold up like it should and would seem to burn off. I tries amsoil and never looked back. Whenever its time to change my oil, not only does it still have great lubricity, I drain out the same amount that I put in and it holds up even if I’m busy and cant change it immediately. It also makes my engine run a lot more quiet. I definitely recommend this stuff, if you love your truck or machine, you want to make sure its well lubricated so its not wearing excessively and will be around beyond its potential. Give er the good stuff, Amsoil is that good stuff!

Best Synthetic oil out there!

By  WENDELL,  a  Verified Buyer  from  utah  on  December 06, 2024
I put Amsoil in everything I own. People complain about the cost, but I can go 1 year+ between oil changes in my Duramax Diesel. People don’t realize engines with turbos break down oils a lot quicker because of the intense heat (1700 degrees). Oil circulates through the turbo, Amsoil does not break down like other oils in that kind of temperature.

New customer

By  JIM,  a  Verified Buyer  from  Texas   on  February 21, 2024
The ordering process was great and I have made my first trip pulling my 5th wheel. It seems to help my engine temperature was a couple of degrees cooler. I look forward to more traveling.

Keeps my engine strong

By  ANDREW,  a  Verified Buyer  from  California   on  February 19, 2024
Have over 400k on my duramax and can almost guarantee it’s still going because of this great oil!