Quaker State HD SAE 30 motor oils are formulated to deliver consistent wear and viscosity protection throughout the life of the oil. Independent laboratory tests show that HD motor oils beat industry wear standard with 3 times better wear protection. The used oil also passed the industry standard.

 
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