INDEPENDENT DEALER
Knightdale, NC | (919) 618-9623
AMSOIL Synthetic Diesel Oils
Diesel oil is undergoing a major change. The new API CK-4 and FA-4 diesel oil specifications are here, and an overhauled AMSOIL synthetic diesel oil lineup launches Feb. 6, bringing even better protection and performance with it.
New Specifications, New Diesel Oils
The new API CK-4 and FA-4 specifications focus on these six goals:
Reduced emissions
- Improved wear protection
- Improved fuel economy
- Stronger oxidation stability
- Better shear stability
- Increased resistance to aeration
The new API CK-4 specification is designed for current model-year and older diesel engines and is backward-compatible with API CJ-4 (and prior) oils. Going forward, all applications calling for a diesel oil meeting API CJ-4 (and prior) specifications should use an API CK-4 diesel oil.
The new API FA-4 specification is designed to further improve fuel economy and reduce emissions. FA-4 oils are not backward-compatible and may only be used in certain 2017 and newer over-the-road trucks, when approved by the original equipment manufacturer (OEM).
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil
Signature Series Max-Duty Synthetic Diesel Oil represents the top tier of AMSOIL protection and performance for diesel engines. Signature Series will be available in 5W-30, 0W-40, 5W-40 and 15W-40 viscosities.
- Exceptional cold-temperature performance
- 6X more engine protection*
- Significantly exceed industry requirements
- Full OEM specification coverage
- Reduced oil consumption
AMSOIL Heavy-Duty Synthetic Diesel Oil
AMSOIL Heavy-Duty Synthetic Diesel Oil will provide outstanding protection and performance for customers seeking an upgrade over conventional and other synthetic diesel oils. AMSOIL Heavy-Duty Synthetic Diesel Oil will be available in 10W-30, 5W-40 and 15W-40 viscosities.
- Reduced oil consumption
- 4X more engine protection*
- Excellent opportunity for price-conscious customers to move up to AMSOIL quality
Signature Series Max-Duty Synthetic Diesel Oil 15W-40
Product Code: DMEQT-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 5W-40
Product Code: DEOQT-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 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.
Heavy-Duty Synthetic Diesel Oil 15W-40
Product Code: ADPQT-EA
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 Synthetic Diesel Oil 5W-40
Product Code: ADOQT-EA
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 Synthetic Diesel Oil 10W-30
Product Code: ADNQT-EA
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.
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.
SAE 15W-40 Heavy-Duty Diesel and Marine Oil
Product Code: AMEQT-EA
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.
Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil
Product Code: HDDQT-EA
Engineered for pre-2007 diesel engines in on-road applications as well as all model year diesel engines in off-road applications. Also engineered for all gasoline engines recommending API SL specifications including turbo-charged vehicles. Provides superior wear protection and fuel efficiency.
10W-30/SAE 30 Synthetic Heavy-Duty Diesel Oil
Product Code: ACD1G-EA
Exceeds both 10W-30 multi-grade and SAE 30 straight-grade viscosity requirements. Provides outstanding performance in pre-2007 diesel engines in on-road applications as well as all model-year diesel engines in off-road apps. Also recommended for gasoline engines requiring API SL or previous specifications.
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.
CONTACT
James Peszko
206 Dearing Drive
Knightdale, NC, 27545
United States
United States
(919) 618-9623
© AMSOIL INC. 2025