TY26679: Premium Engine Oil, Plus-50T II, SAE 15W-40, API CK4/SN, 18.9 Liter (5 Gallon). For use in heavy-duty off-road applications, on-road trucks, marine engines, natural gas engines, pickups, and automobiles. Backwards compatible for use in all legacy diesel engine applications where Plus-50T may have been applied. For use in John Deere Tier 4 engines and all diesel engines requiring API CK-4 oil.