By way of analysis on the action mechanism of VI improver and deposit-forming mechanism,the effect of VI improver on piston deposit-forming tendency of diesel engine is discussed.

• 通过对粘度指数改进剂的作用机理及沉积物的生成机理的分析,探讨了粘度指数改进剂对柴油机油活塞沉积物的影响,阐明了粘度指数改进剂的分子量、加入量及结构组成和沉积物的生成关系。