Marine medium speed oil has excellent quietness and dispersion，Show maintenance to the core parts of the starter，Avoid carbon accumulation and heavy oil environmental pollution;Excellent causticizing stability，It can reasonably avoid the production of high temperature deposits，The oil lasts longer;Excellent oxidation and corrosion resistance and rapid rate of acid synthesis，Unusual high alkaline naphthenate technology，Reasonable synthesis of acidic substances caused by the ignition of high sulfur fuel，Reasonable reduction of corrosion and wear of cylinder and piston rod;Excellent base maintenance，Reasonably avoid the reduction of base value caused by air oxidation and acid hydrolysis，In a long oil change cycle time to the starter show the whole process of reasonable maintenance of excellent durability，Ensure adequate oil film compressive strength at high temperatures and pressures，Reduce friction and wear。