To use in today's higher horsepower outboards. Also recommended for use in oil injection systems. TC-W3 provides superior protection against piston scuffing, bearing wear, spark plug fouling, pre-ignition, and rust. This ashless oil meets or exceeds all engine manufacturers' warranty requirements and is NMMA certified. TC-W3 also meets the specified requirements of all foreign and domestic 2-cycle outboard manufacturers. Will not void your warranty.