What are the effects of not changing engine oil for a long time?

1 Answers
StMarley
07/29/25 7:32pm
Long-term failure to change engine oil will result in: increased engine noise, poor internal lubrication leading to accelerated wear of internal components, and reduced engine lifespan. For semi-synthetic oil, replacement is required every 6 months or 5,000 kilometers. If full synthetic oil is used, it should be replaced within 10,000 kilometers or one year. The cooling effect of oil diminishes as deteriorated oil significantly reduces heat dissipation capability since oil's heat absorption and thermal conductivity are far superior to water. The lubrication function declines as the viscosity of oil gives it strong adhesion, allowing it to form a protective film between gears, shafts, and other components for smooth operation and reduced wear. Deteriorated oil largely loses this capability.
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