What are the causes of engine oil burning in cars?

[DiRiley]

There are several reasons for engine oil burning in cars: 1. Aging valve seals: Valves are designed to prevent oil from leaking into the combustion chamber. Over time, they can wear out and age, leading to poor sealing, which allows oil to enter the combustion chamber. 2. Increased piston clearance: Prolonged engine operation can lead to carbon buildup and wear in the piston area, resulting in increased piston clearance and allowing oil to enter the combustion chamber. 3. Criteria for diagnosing oil burning issues: Normal oil consumption is generally below 0.3L/1000 kilometers. If the consumption exceeds this value, it indicates that the engine is burning oil and requires timely repair.