This TC-W3 certified oil burns cleaner maximizes performance and is strong enough for high-horsepower outboard engines such as Mercury OptiMax and other direct fuel-injected (DFI) engines. Recommended for use in liquid-cooled 2-cycle engines with oil injection systems or for premix which require a TC-W3 oil. Features: Advanced synthetic-blend formulaMaintains peak performance in strenuous conditionsTC-W3 certified Recommended for use in liquid-cooled, 2-cycle systems Advanced synthetic-blend formula | Premium Plus TC-W3 2-Stroke Engine Oil, Gallon