Why Do Some Cars Burn Engine Oil?

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Here are the specific reasons for burning engine oil: 1. Worn valve seals: Valves are used to prevent oil from leaking into the combustion chamber, but over time, they can wear out or age. Severe wear can affect the sealing performance of the valves, making it easy for oil to burn. 2. Excessive piston clearance: When a car is used for a long time, carbon deposits from incomplete combustion can accumulate on the piston rings. If not cleaned for an extended period, this can enlarge the gap between the piston rings and the cylinder wall, allowing oil to enter the combustion chamber and cause oil burning. In severe cases, it can even lead to engine seizure. 3. Driving habits: Frequent rapid acceleration and prolonged high-speed driving can easily damage the lubricating oil film, leading to poor engine lubrication and wear on certain parts, which may also result in oil burning. 4. Excessive oil level: If the oil level is too high and exceeds the maximum mark, the excess oil can easily enter the combustion chamber (due to excessive internal pressure) and form gummy carbon deposits.