Why does the engine warning light come on after an oil change?

1 Answers
Rosa
07/30/25 7:07am
There are many reasons why the engine warning light comes on after an oil change. The causes of the warning light coming on include the following: 1. Oil type: Engine oils produced by different manufacturers cannot be mixed. When changing to a different brand of engine oil, the engine should be cleaned to prevent the old and new oils from reacting and affecting the oil quality. If the old oil is not completely drained and is incompatible with the new oil, it may cause the warning light to come on. 2. Residual old oil: If the residue from the old oil is not thoroughly cleaned, the new oil may not last long, clogging the oil filter and causing the warning light to come on. Changing the oil filter during the oil change can also eliminate the factors that cause the warning light to come on. 3. Oil filter: Some oil filters are of poor quality and have inadequate oil filtration performance. Replacing the oil filter during the oil change can also eliminate the phenomenon of the warning light coming on.
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