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Diesel Oils
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Signature Series Max-Duty Synthetic Diesel Oil 15W-40 
Product Code: DMEQT-EA
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 Signature Series Max-Duty delivers 6X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222, delivering the security of providing your diesel the extra protection it deserves.
Signature Series Max-Duty Synthetic Diesel Oil 5W-40
Product Code: DEOQT-EA
Delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.
Signature Series Max-Duty Synthetic Diesel Oil 0W-40
Product Code: DZFQT-EA
Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 4X better cold-temperature performance when compared to SAE 15W-40 oil in ASTM D5293 cold cranking viscosity test. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.
Signature Series Max-Duty Synthetic Diesel Oil 5W-30
Product Code: DHDQT-EA
Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.
Signature Series Max-Duty Synthetic Diesel Oil 10W-30
Product Code: DTT1G-EA
Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.
Heavy-Duty Synthetic Diesel Oil 15W-40
Product Code: ADPQT-EA
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.
Heavy-Duty Synthetic Diesel Oil 5W-40
Product Code: ADOQT-EA
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.
Heavy-Duty Synthetic Diesel Oil 10W-30
Product Code: ADNQT-EA
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.
Synthetic Diesel Oil SAE 0W-20
Product Code: DP020QT-EA
AMSOIL 100% Synthetic Diesel Oil is specifically formulated to protect the efficient diesel power of American diesel pickups, vans, cars and SUVs, giving you the edge to keep your vehicle operating at peak performance. It delivers outstanding value and excellent protection for customers seeking an upgrade over conventional, synthetic-blend or competing synthetic diesel oils.
Synthetic Diesel Oil SAE 5W-30
Product Code: DP530QT-EA
AMSOIL 100% Synthetic Diesel Oil is specifically formulated to protect the efficient diesel power of American diesel pickups, vans, cars and SUVs, giving you the edge to keep your vehicle operating at peak performance. It delivers outstanding value and excellent protection for customers seeking an upgrade over conventional, synthetic-blend or competing synthetic diesel oils.
SAE 15W-40 HEAVY-DUTY DIESEL AND MARINE OIL
Product Code: AMEQT-EA
  • Recommended for applications specifying API CI-4+ and prior specifications
  • Controls soot and wear
  • Reduces oil consumption and emissions
  • Delivers maximum engine protection over extended drain intervals
  • Provides outstanding protection and performance in temperature extremes
10W-30 Commercial-Grade Diesel Oil
Product Code: SBDTTP-EA

AMSOIL Commercial-Grade Diesel Oil is an advanced synthetic-blend oil with greater than 50% synthetic content. Specially engineered for commercial equipment, it provides 2X better wear protection,1 helping you keep trucks and equipment operating at peak performance. AMSOIL Commercial-Grade Diesel Oil provides outstanding value and excellent protection for customers seeking an upgrade over conventional diesel oils.

15W-40 Commercial Grade Diesel Oil
Product Code: SBDFTP-EA

AMSOIL Commercial-Grade Diesel Oil is an advanced synthetic-blend oil with greater than 50% synthetic content. Specially engineered for commercial equipment, it provides 2X better wear protection,1 helping you keep trucks and equipment operating at peak performance. AMSOIL Commercial-Grade Diesel Oil provides outstanding value and excellent protection for customers seeking an upgrade over conventional diesel oils.

Premium Protection 20W-50 Synthetic Motor Oil
Product Code: AROQT-EA

For use in both diesel and gasoline engines. Ideal for applications where the extra protection of a higher-viscosity oil is desired. The higher viscosity may help reduce motor oil consumption in equipment experiencing higher than normal oil usage rates while running lower viscosity lubricants.

Premium Protection 10W-40 Synthetic Motor Oil
Product Code: AMOQT-EA

For use in both gasoline and diesel engines. Offers multi-functionality and wear protection. Ideal for applications where the extra protection of a higher-viscosity oil is desired. Excellent for motor homes and older vehicles, as well as many types of modern equipment and compatible with some motorcycles.

DOMINATOR 20W-50 Competition Diesel Oil
Product Code: DCOQT-EA

AMSOIL DOMINATOR® 20W-50 Competition Diesel Oil is designed for professionals and enthusiasts who want a step up in diesel protection. It is specifically designed for high-horsepower diesel engines and delivers the benefits most important to diesel competitors, including robust durability, outstanding bearing protection and the ability to withstand the extreme pressures and temperatures common to diesel competition.
SAVE UP TO 25%

$10 for a six-month membership
Save up to 25% on Every Order
Exclusive promotions and more
FREE SHIPPING

Order $100 or more in AMSOIL products at full retail prices and receive free ground shipping anywhere in the continental U.S.