According to the performance requirement of marine diesel engine oil,by studying the effect of base oils and various functional additives on the oil resistance to water and watershed performances,and the effect of dispersion agents,antioxidant and antiwear additives on the high temperature detergency,soot dispersion,abrasion resistance and antioxidant and corrosion resistance of the oils,a new type of marine diesel engine oil formulation was formed.Comprehensive test evaluation shows that the developed marine diesel engine oil has excellent physical and chemical properties,good performances of soot dispersion,abrasion resistance and antioxidant and corrosion resistance,and pa