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, chainsaws, and other 2-Stroke power equipment. Royal Purple hp 2-C is a high performance synthetic engine oil that improves 2-cycle performance and reduces wear in both standard and high performance 2-cycle gasoline engines. Engineered with Royal Purple advanced technology, hp 2-C is completely ash less to minimize deposits in the combustion chamber and exhaust system.