Abstract: The gasoline engine oil with independent intellectual property rights to meet SN/GF-5 specification was developed by using domestic additives and base oil. The combination of complex antioxidant, complex antifriction agent and anti-wear agent zinc dialkyldithiophosphate(ZDDP) for gasoline engine oil was selected by simulation test. The results show that the composite antioxidants with the mass ratio of long chain diphenylamine antioxidants and phenol ester antioxidants of 3:7 can greatly improve the antioxidant performance of the lubricating oil. The friction-reducing performance of the oil can be improved obviously by the combination of the amide friction modifier and the molybdenum carbamate, and the wear-resisting performance of the di-sec-alkyl ZDDP is the best among the three structures. The developed gasoline engine oil has passed the engine tests of program ⅢG, ⅢGA, ⅢGB, ⅣA, ⅤG, ⅥD, Ⅷ, and each performances has reached the SN/GF-5 specification.

Key words: SN/GF-5 specification, gasoline engine oil, additives, engine Test