AMSOIL Signature Series 0W-40 100% Synthetic Max-Duty Diesel Oil
- Outstanding extreme-pressure protection
- Delivers 6X more wear protection1
- Maintains proper viscosity (thickness)
- Minimizes oil consumption
- Maximizes fuel efficiency
- Excels in extreme temperatures
- Confidently extend drain intervals 1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation
Product code : DZFQT-EA
BUY NOW See the Product Data Bulletin for full DetailsAMSOIL Signature Series 0W-40 100% Synthetic Max-Duty Diesel Oil
AMSOIL 15W-40 Commercial-Grade Diesel Oil
Developed to protect the horsepower diesel enthusiasts crave and extend the life of hard-working commercial equipment in the most severe conditions. Signature Series synthetic technology delivers max-duty protection in on- and off-road applications.
MAXIMUM ENGINE PROTECTION
MAXIMUM ENGINE PROTECTION
- Delivers 4X better cold-temperature performance1
- Provides long-lasting wear protection, keeping cylinder liners looking like new2
- Delivers up to 60 percent better turbo cleanliness3
- Withstands the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower
- Provides up to 2X better rust protection4
1When compared to SAE 15W-40 oil in the ASTM D5293 Cold Cranking Viscosity test
2Based on independent testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
3Based on specification standards of CAT C13 2nd Ring Top Land Carbon testing
4Based on industry standard testing using the NMMA FC-W Rust Test.
AMSOIL FIGHTS WEAR
AMSOIL FIGHTS WEAR
AMSOIL delivers powerful engine protection. How good is it? In third-party testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new.DD

DDBased on third-party testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222. *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.
KEEPS TURBOS CLEAN
KEEPS TURBOS CLEAN
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides protection boosted to the max, delivering up to 60% better turbo cleanlinessJ and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.
JBased on specification standards of CAT C13 2nd Ring Top Land Carbon testing
PROTECTS AGAINST RUST
PROTECTS AGAINST RUST
Provides up to 2X better rust protection.K

K Based on industry standard testing using the NMMA FC-W Rust Test.
VISCOSITY CONTROL
VISCOSITY CONTROL
- Resists oxidation and the thickening effects of soot contamination
- Retains viscosity after high-temperature service for maximum engine protection and efficiency
- Provides up to 76 percent less oil consumption5
5Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test
REDUCES OIL CONSUMPTION
REDUCES OIL CONSUMPTION
Signature Series Max-Duty Synthetic Diesel Oil provides up to 76% less oil consumption.L

LThan required by the API CK-4 standard in the Caterpillar-1N oil consumption test.
EXCELS IN EXTREME TEMPERATURES
EXCELS IN EXTREME TEMPERATURES
- Provides outstanding protection and performance in hot and cold temperature extremes
- Resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils.
- Stays fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear.
EXCELS IN EXTREME COLD
EXCELS IN EXTREME COLD
AMSOIL 0W-40 Signature Series Max-Duty Synthetic Diesel Oil delivers 4X better cold-temperature performance when compared to SAE 15W-40 oil in the ASTM D5293 Cold Cranking Viscosity test.
TECHNICAL SERVICES
AMSOIL Signature Series 0W-40 100% Synthetic Max-Duty Diesel Oil
Data Bulletin
Literature Sample
Warranty
SDS
SERVICE LIFE
SERVICE LIFE
AMSOIL Commercial-Grade 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.
PRODUCT WARRANTY
PRODUCT WARRANTY
Using AMSOIL synthetic lubricants or practicing extended drain intervals does not void your new vehicle or equipment manufacturer's warranty. All AMSOIL lubricants and filters are covered by the AMSOIL Limited Warranty For complete information visit AMSOIL.com/warranty.aspx.
HEALTH & SAFETY
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 at AMSOIL.com or upon request at 715-392-7101. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.