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The reason why cars don’t emit blue smoke when burning engine oil

By, CoolMotor

• 2024-04-18
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1. The oil consumption increases but no blue smoke is emitted, which means that the oil does not flow into the combustion chamber. It is also possible that oil has entered the combustion chamber, but the amount of oil entering the combustion chamber is not enough to cause the exhaust to produce blue smoke.

Solution: Check whether there is oil leakage in the engine and add oil appropriately.

2. The reduced sealing performance of the engine's valve oil seal will cause the vehicle to burn engine oil. The valve oil seal is made of rubber. It will harden after working at high temperature for a long time. The hardened valve oil seal will lose its sealing effect and the oil will flow into the combustion chamber along the valve guide, causing the engine to burn oil.

Solution: It is recommended to replace the valve oil seal.

3. Failure of the piston ring of the engine piston will also cause oil burning. When the piston rings are worn to a certain extent, the oil on the cylinder wall cannot be scraped clean, and the oil will remain on the cylinder wall, which will cause the engine to burn oil.

Solution: It is recommended to replace the engine piston.

4. Failure of the oil-gas separator outside the engine will also cause the engine to burn oil. The oil-gas separator is responsible for separating exhaust gas and oil vapor in the crankcase. When the oil and gas separator fails, the oil vapor cannot be completely separated, so part of the oil vapor will be sent back to the combustion chamber to participate in combustion.

Solution: It is recommended to find a professional for repair.

5. The reason why the engine burns oil may also be caused by flaws in the crankcase design. Normal oil burning will not cause blue smoke, but very serious oil burning will cause blue smoke from the exhaust.

Solution: It is recommended to go to a 4S store for professional evaluation.