Performance Without Compromise: At PEAK, we're the independent guys, running a family-owned business that's nothing like Big Oil. Here, American-made quality and value go into good, honest oil, with everything your engine needs to run right for the long haul. Exceeds U.S. and import car and light truck warranty requirements for all automotive gasoline engines currently in use where a SAE 30 monograde that meets API SN or previous API standards is specified. API Service SN Prevents Thermal Breakdown Reduces Friction & Wear Helps Prevent Deposits & Sludge