The Yamaha Motor Corp. produces a line of regular and synthetic oils under the Yamalube label. In recent years, the Yamalube 2 cycle oil types available include 2R, 2W, 2S and 2M. The Yamalube 2R oil is intended for use with motocross engines, while the 2W is intended for WaveRunners and other sporting boats.
ATVs, golf carts, snowmobiles, and motorcycles can all benefit from the use of Yamalube 2S oil. Yamalube 2M is particularly useful for two-stroke outboard boat motors. If you do not have a two-stroke engine, then I would still advise looking into other Yamaha engine oil for your needs as the brand is incredibly trustworthy.