Abstract: According to the Coordinating European Council CEC L-88-02 method，the PSA TU5 engine was used as the test machine to establish an evaluation bench for light load engine oils. The reference oil RL216 and test oil were selected for the evaluation method establishment of high temperature deposits and piston ring bond of gasoline engine oil. The test results showed that the calibration of reference oil met the calibration range of the method. The bench test had a good repeatability and could be used to investigate the motor kinematic viscosity growth of engine oil，piston sediment and piston ring bond，engine oil consumption and other indicators，and to distinguish the high temperature oxidation resistance and cleanness of different engine oils. The experimental results indicated that the content of elements Zn and P in the test oil showed an upward trend，and that the increase of kinematic viscosity expressed some relations with oil consumption. Reducing the base oil evaporation loss of the engine oil was beneficial to passing through the TU5 stand. The establishment of TU5 engine bench can better provide the bench support and evaluation means for the development of high-grade engine oil in China.

Key words: gasoline engine oil, high temperature deposit, detergency, viscosity growth, ring bonding, bench, evaluation