Royal Purple HP 2-C (formerly 2-C TCW III) is recommended for use in both pre-mixed and oil injected gasoline 2-cycle engines in outboard motors, motorcycles, jet skis, chain saws, etc. For cold weather oil injected applications, Royal Purple recommends its Snow 2-C. Royal Purple HP 2-C is a high performance engine oil that improves performance and reduces wear in both standard and high performance 2-cycle gasoline engines. HP 2-C has synthetic solvency that keeps spark plugs and exhaust ports clean for maximum engine efficiency. This engine cleanliness combined with the low coefficient of friction of Royal Purple HP 2-C promotes increased horsepower and engine speed. Engines operate with greater combustion efficiency and go longer between overhauls when lubricated with HP 2-C. HP 2-C is suitable for premix in snowmobiles; however, due to cold soak (low temperature pump ability issues with oil injected snowmobiles) Royal Purple recommends Snow 2-C for operation in temperatures below 20 Degree Fahrenheit.