It is suitable for medium and high speed marine diesel engines and generator sets that use fuels such as ordinary diesel, mixed diesel and DMC fuels with a sulfur content of less than 1%. Specially formulated, it is a medium-high speed multi-purpose general-purpose marine engine oil that can adapt to different climate characteristics of the four seasons; it has unique anti-wear and cleaning ability, improves engine life and internal engine cleaning, and reduces the frequency of machine maintenance; The base value prevents engine corrosion and wear caused by the use of high sulfur fuels, and better compatibility with engine performance reduces the "black paint film" and sludge formation.