What Causes Engine Exhaust Pipe to Spray Engine Oil?
2 Answers
Engine exhaust pipe spraying engine oil is caused by: 1. Failure of piston, cylinder liner, piston pin, or piston rings. The damaged parts need to be identified and replaced; 2. Severe wear between the valve stem and valve guide, or poor sealing, resulting in excessive clearance and oil leakage downward; 3. Some vehicle models have inherent design defects that cause slight oil dripping from the exhaust, which is not obvious and does not cause significant impact. The car exhaust pipe serves to reduce vibration and noise for the vehicle body, extending the lifespan of the exhaust muffler system. Its main material is stainless steel.
When the engine's exhaust pipe sprays oil, I suspect it might be due to worn piston rings, which allow oil to seep into the combustion chamber, mix with gasoline, and eventually be expelled through the exhaust. Another possibility is a failed valve guide seal—aging or overheating can cause it to crack and leak oil. If the car is turbocharged, a damaged turbocharger seal could also allow oil to leak into the exhaust system. Additionally, a damaged cylinder head gasket might connect the oil passage. In any case, this issue should not be taken lightly, as it can lead to high oil consumption, air pollution, and even blue smoke from the tailpipe, affecting performance and safety. It's recommended to take the car to a repair shop for inspection as soon as possible and avoid delaying the fix.
