Yamaha Motor Corporation is the maker of the Yamalube line of regular and synthetic two-stroke engine oils. Each type of oil is formulated for specific two-stroke engine applications. Currently Yamalube produces 2R, 2W, 2S, and 2M oil.
Typically, 2R is used for motocross engines while Yamalube 2W oil is used for and motorboats. Yamalube 2M is also useful for outboard motorboats. Snowmobiles, motorcycles, all-terrain vehicles, scooters, and even golf carts utilize 2S oil.