Designed for the needs of 4-Stroke WaveRunners and Sport Boats Heavily fortified with detergents, anti-wear and corrosion additives to protect in the harsh marine environment This oil will provide the anti-corrosion and anti-wear performance demanded by products in a marine environment. When it comes to performance and protection, there is only one choice-Yamalube. Brand new, genuine Yamaha Yamalube 10W-40 4W Watercraft/Waverunner Oil Gallon. This is a factory original equipment accessory, not aftermarket.