Yamaha New OEM WaveRunner Boat Oil Case of 4 Gallons 10W-40 4W LUB-10W40-WV-04 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.