Oil Specifications

API ratings, OEM proprietary specs, and viscosity grades for Class 8 diesel engines. Find the right specification for your engine before you buy.

Viscosity Grades

Standard grade for most Class 8 diesel engines. CK-4 required.

GHG17 Detroit, Volvo D13, Mack MP8 fuel-efficient spec.

Cold climate alternative to 15W-40. CK-4 required.

Not interchangeable. CK-4 is backward compatible, FA-4 isn’t. Here’s the difference.

Detroit’s GHG17 oil specification. DD13/DD15/DD16.

Cummins current engine oil standard. X15, X12, ISX.

Volvo D13/D11/D16 oil spec. CK-4 equivalent.

2021+ D13 Turbo Compound. FA-4 fuel-efficient spec.

Mack MP7/MP8/MP10 oil spec. CK-4 baseline required.

Mercedes-Benz FA-4 fuel-efficient spec. Freightliner Cascadia.

Allison automatic transmission spec for diesel engines.