Abstract: With the upgrading of heavy-duty diesel engine oil, the requirement for properties of engine oil is strengthening, especially for antiwear property. Thus, selecting optimum antiwear testing method in lab to simulate the operation conditions of Mack T-9 engine test is essential for the development of heavy-duty diesel engine oil. Test results show that SRV bench test is suitable to be used to evaluate the antiwear properties of various diesel engine oils. Furthermore, the effect of five additives on the antiwear properties of heavy-duty diesel engine oil was investigated by SRV testing, and the results show that properly adding more zinc dialkyldithiophosphate and using suitable anti-wear agents could improve the antiwear performance of diesel engine oil significantly.

Key words: diesel engine oil, anti-wear, simulating method, additives