Formulated for high tech direct injection 2-stroke engines, but compatible with carbureted outboards. If youre looking for a 2-stroke oil that is compatible with a wide range of engines, look no further than Sierra 2-Stroke Marine Premium Engine Oil. This 2-stroke oil is compatible with both carbureted and EFI engines and meets the high demands of direct injections outboards like Mercury Optimax, Yamaha HPDI and Johson/Evinrude Fich and DI motors. For a 2-stroke oil that will work for older outboards and todays high-tech 2-strokes, pick up some Sierra 2-Stroke Marine Premium Engine OilTC-W3. Key Features High quality 2-stroke oil formulated for modern and older outboards Engineered for engine protection in marine conditions Compatible with carbureted, EFI and direct injection (DFI) engines Meets required specifications for Mercury Optimax, Yamaha HPDI and Johson/Evinrude Fich and DI engines