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发动机机油使用一段时间后，由于油内进入了外来杂质和机油本身产生了有害物质，会改变机油的理化性质，使之失去润滑、密封、冷却和防腐功能，导致发动机技术性能和使用寿命下降。为了确保发动机能长期正常地运转，必须适时地更换润滑系统的全部润滑油。 １．发动机机油污染的
Engine oil used for some time, due to foreign oil into the oil and the oil itself produces harmful substances, will change the physical and chemical properties of oil, so that loss of lubrication, sealing, cooling and corrosion protection, resulting in engine performance and life expectancy decline. In order to ensure long-term normal operation of the engine, the lubrication system must be replaced in due course. 1. Engine oil polluted