It's depend on how do you drive, what kind oil, what kind car/age...When you change oil at 3kmi, the oil still have same color? How about 2.9kmi? 2.5kmi? The engine wear and oil break down are a gradually progress. For my car, 2.5kmi oil already will lower the engine life for fact.
Do you want save the engine or save the oil?
Do you want save the engine or save the oil?
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