Castrol GTX exceeds demanding U.S. high shear and stay-in-grade requirements for viscosity breakdown protection. Far exceeds the demanding U.S. requirements for viscosity breakdown in every grade! Engineered to provide maximum protection against viscosity and thermal breakdown! Anti-oxidants, detergents and dispersants provide unsurpassed protection against thermal breakdown. Exceeds passenger car and gasoline light truck requirements for the protection of gasoline and turbocharged engines where API SM, SL, SJ or SH is recommended. Formulated to exceed engine protection requirements of Ford, GM, and Chrysler Corporation.