Starfire Premium Plus 15W40 CK-4 Diesel Engine Oil is formulated to provide dependable lubrication and protection for heavy-duty diesel engines. Its SAE 15W40 viscosity delivers reliable performance across a range of operating temperatures, while the API CK-4 service category is designed for modern heavy-duty diesel engine applications. The oil helps protect against wear, deposits, oxidation, and oil breakdown during demanding service conditions. Supplied in a 5-gallon pail, it is well suited for commercial vehicles, trucks, fleets, and professional maintenance operations.
