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介绍了内燃机车用第四代润滑油的组成和技术标准，提出四代油在混用中的诸多问题，以及在各型机车上的应用情况。
The composition and technical standards of the fourth generation of lubricating oil for diesel locomotive are introduced. Many problems of the fourth generation of oil in mixing are put forward, as well as the application on various locomotives.