Castrol GTX High Mileage 5W30 Motor Oil contains a blend of antioxidants, detergents and dispersants to help protect against thermal breakdown in higher-mileage vehicles.Product Features:Engineered to provide protection against viscosity breakdownContains antioxidants, detergents and dispersants to help protect against thermal breakdownExceeds API SM and is recommended wherever API SN SM, SL, SJ, SH, SG and previous API S categories are recommended