Signature Series Max-Duty Synthetic Diesel Oil 15W-40

MAXIMUM ENGINE PROTECTION
Delivers 6X more wear protection,1 delivering extra protection so you can push your diesel with peace of mind
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
1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation
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.