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本文介绍了内燃机润滑油的基本构成。简要地阐述了机油对发动机性能和环境的影响，简介了我国内燃机油的分类及其选择的方法和更换使用的注意事项。
This article describes the basic composition of the internal combustion engine lubricating oil. The effects of engine oil on engine performance and environment are briefly described. The classification of internal combustion engine oil and the method of selection and precautions for its replacement are briefly introduced.