Quaker State (550035190-6PK) SAE 30 Heavy Duty Motor Oil - 1 Quart, (Pack of 6) Wear is one of the toughest enemies your engine faces; it can reduce engine life and rob your engine power; Quaker State heavy duty motor oils are engineered to reduce wear and protect against high temperature and severe service operation Quaker State heavy duty motor oils meet or exceed API SN and prior API SM, SL, SJ service categories Heavy duty motor oil contains acid neutralizing additives to stop combustion acids from corroding your engine Provides stay in grade viscosity throughout the oil drain period Wear is one of the toughest enemies your engine faces; it can reduce engine life and rob your engine power; Quaker State heavy duty motor oils are engineered to reduce wear and protect against high temperature and severe service operation Quaker State heavy duty motor oils meet or exceed API SN and prior API SM, SL, SJ service categories Heavy duty motor oil contains acid neutralizing additives to stop combustion acids from corroding your engine Heavy duty motor oil still pass the industry wear requirements; provides stay in grade viscosity throughout the oil drain period