How to Determine When to Change Car Engine Oil

1 Answers
JohnnyAnn
07/29/25 9:12am
Methods to determine when to change car engine oil are: 1. Check the oil viscosity - change if it lacks viscosity; 2. Change if the oil color turns black; 3. Change if there are excessive black particles, metal shavings, or carbon deposits in the oil; 4. Change if the oil has an abnormal smell. The functions of engine oil are: 1. To separate the surfaces of relatively sliding parts, thereby reducing wear; 2. To bring heat back to the oil tank and dissipate it into the air, helping the radiator cool the engine; 3. To circulate carbon deposits, sludge, and worn metal particles from engine components back to the oil tank, flushing away dirt generated on working surfaces through oil flow.
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