Abstract:

The effects of test oil SN 0W20 and reference oil SM 5W30 on the fuel economy of engine are compared by engine bench test. The results show that the use of lubricating oil with low viscosity can reduce the mechanical friction loss of engine by about 34% to 57%. The average specific fuel consumption in all conditions decreases by 1% to 35%. A durability test with the low viscosity lubricant SN 0W20 is conducted and after that the performances of engine is tested and the physical and chemical indexes and element contents of lubricating oil are analyzed. The results show that after the durability test of engine, the wear amounts of all friction pairs are relatively little, the extent of performance decline is within the normal range, indicating that the viscosity grade of SN0W20 can meet the requirements of engine durability.

Key words: engine, mechanical friction loss, lubricating oil, durability test