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Why is it necessary to change car engine oil?

1 Answers

MadelynDella

07/30/25 4:07am

Reasons for changing car engine oil are as follows: 1. Engine oil generates impurities during lubrication: During the lubrication process, engine oil is gradually consumed, producing impurities that affect its lubricating performance, hence requiring regular replacement. 2. Prolonged failure to change oil leads to reduced cooling effectiveness: Cooling is one function of engine oil, and after extended use, its cooling capability diminishes. 3. Not changing oil results in decreased sealing performance: Due to prolonged use and heating, chemical reactions inevitably occur in the oil, reducing its sealing properties. 4. Engine oil gradually depletes during use: When the piston moves downward, a thin oil film forms on the cylinder wall. During high-speed operation, some oil is drawn into the combustion chamber and burned along with the air-fuel mixture.

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