What Causes Engine to Burn Oil?

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Engine oil burning can occur due to several reasons, including worn piston rings, valve seals, or cylinder walls, allowing oil to leak into the combustion chamber where it burns alongside fuel. Additionally, a damaged or faulty PCV (positive crankcase ventilation) system can lead to excessive oil consumption by not effectively recirculating oil vapors. Overfilling the oil reservoir beyond the recommended level can cause oil to be pushed into the combustion chamber and burn. In older engines, worn-out gaskets and seals can develop leaks, allowing oil to escape and burn. High engine temperatures or prolonged idling can accelerate oil breakdown, causing it to burn more rapidly. Regular maintenance, such as checking and replacing worn components, using the correct grade of oil, and maintaining proper oil levels, can mitigate oil-burning issues and extend the engine’s lifespan.

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