Quaker State (550024137-12PK) SAE 30 HD Motor Oil - 1 Quart, (Pack of 12) Wear is one of the toughest enemies your engine faces; it can reduce engine life and make it powerless; Quaker State HD motor oils are engineered to reduce wear and protect against high temperature and severe service operation Quaker State HD motor oils meet or exceed API SN and prior API SM, SL, SJ service categories HD motor oil contains acid neutralizing additives to stop combustion acids from corroding the engine Provides stay in grade viscosity throughout the oil drain period