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论述了研究汽车内燃机润滑油换油期的重要性，分析了确定换油期各种方法的特点及发展趋势，提出了今后研究的方向。
The importance of studying oil change period of internal combustion engine lubricating oil is discussed. The characteristics and development trends of various methods for determining oil change period are analyzed. The direction of future research is put forward.