SAE 10W-30 CK-4, SAE 10W-30 FA-4, SAE 15W-40 CK-4
Wakefield Heavy Duty Diesel Engine Oils are available in conventional and semi-synthetic formulas engineered for use in high speed four-cycle diesel engines in on- and off-road applications. Our lubricants meet the new API CK-4 specs meant for vehicles produced in 2017 and beyond, and are backward compatible with most applications where engine manufacturers currently recommend API CJ-4 oils.
Our API FA-4 oils are only intended for use in newer, post-2017, on-highway diesel engines with limited or no backward compatibility. Please always check your manuals before selecting a lubricant.