Everyone’s Favorite AMSOIL 5W-40 Heavy-Duty Synthetic Diesel

Amsoil signature series gallon of 5W-40 for Ram and Duramax diesels

And AMSOIL 100% Synthetic adjusted for price. Check out the case price, join as a PC then you get a superior oil for less than the local leading brand that isn't really synthetic anyway.

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AMSOIL’s Lower Cost Heavy-Duty 5W-40 Synthetic Diesel Oil

Always restocking in our shop. Beyond protection of any other brand yet a VERY favorable price.

Formulated for Exceptional Diesel Engine Protection

The real AMSOIL Economizer diesel 5W-40. Cheaper than Signature but no compromise. AMSOIL Heavy-Duty Synthetic Diesel Oil is formulated for hard-working equipment. It is engineered to provide 4X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222, 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.

Product Data Bulletin on the Heavy-Duty Diesel Line – Saves you money with out compromise.

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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 protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222 to help maximize equipment life and reduce maintenance costs and downtime.

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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.

Reduced oil consumption is a hallmark asset with AMSOIL saving you in operational costs including reduced DEF usage.

 

APPLICATIONS

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

  • API CK-4, CJ-4, CI-4+, CF
  • API CK-4/SN
  • 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

Official Oil

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.

 

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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). USA and Canada (M)SDS are available upon request at 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

AMSOIL PRODUCT WARRANTY

AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.

* 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 reviews on the Heavy-Duty line!!

 

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 it’d 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!

Excellent performance and long lasting.

By  ECODiesel,  a  Verified Buyer  from  Oklahoma   on  December 07, 2024

Been running this in my Ram 2500 with the Cummins for a while. Oil stays clean and if you run a bypass system you can run this oil for 20K plus miles.

Review

By  RICHARD,  a  Verified Buyer  from  Ca.  on  December 01, 2024
Have used Amsoil in my Dodge Cummings engine for seven (7) years. Maintains higher oil pressure at an idle than other engine oils. When having the injectors and valves adjusted, my mechanic tells me my upper engine is the cleanest he has ever see that has 228,000 miles on it. Rich Aubuchon owner

Run smoother

By  ADAM,  a  Verified Buyer  from  Onatrio   on  June 06, 2024
Switched from Kubota oil to Amsoil notice huge differences. Bx23s runs smoother.

Longevity

By  Avalon ,  a  Verified Buyer  from  Us East Coast   on  November 16, 2024
AMSOIL 15W40 has been the only oil used in my 1999 Cummins 6BT5.9 along with their filters. EVERY oil analysis from Blackstone has come back with zero negatives. I will always use AMSOIL products in my engines.