Abstract: A new soot dispersion method-diesel engine oil aging-soot dispersion method was established to simulate the Mack T-11 engine test on the basis of the analysis of the Mack T-11 engine test conditions and the soot shape and composition. The influence of different composition ashless dispersant on the dispersion ability of diesel engine oil was investigated by the new dispersion method and molecular simulation technology. The results showed that the new dispersion method could effectively evaluate the soot dispersion performance of the high-grade diesel engine oil. The optimum dispersant was found by the new dispersion method and molecular simulation technology. The engine oil with the optimum additives and base oils passed the Mack T-11 engine test.

Key words: diesel engine oil, engine test, soot, ashless dispersant, molecular simulation technology