The power to reduce friction. American Petroleum Institute Certified for gasoline engines. Friction, the toughest enemy your engine faces. It can reduce engine life and rob you of power. That's why Quaker State Peak Performance 5W-30 is power-engineered to reduce friction. Quaker State's formulation can: Improve engine performance; Resist thermal breakdown; Protect against harmful deposits. Meets or exceeds requirements of ILSAC GF-4, GF-3, API SM and previous API standards. API Service SM Energy Conserving. Not for sale in Mexico. Made in USA.