The automotive technology situation changes with the increase mileage, the use performance will also become worse. The lubrication system is an important component of the engine, and its rational use and timely maintenance is important to extending the life of vehicles. This article describes the composition of automotive engine lubrication system and lubricant selection, and discusses the diagnosis and maintenance of common faults, in order to provide reference for automotive use and maintenance.%随着行驶里程的增加，汽车技术状况会发生变化，使用性能逐渐变差。润滑系统是发动机的重要部件，合理使用和及时维护对延长汽车寿命起着重要的作用。本文介绍了汽车发动机润滑系的组成，润滑油的选择，探讨了常见故障的诊断及保养，以期为汽车使用及修理工作提供参考。
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