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What Causes Engine Oil to Spray from the Exhaust Pipe?

1 Answers

VanJocelyn

07/29/25 7:20pm

Reasons for engine oil spraying from the car's exhaust pipe are as follows: 1. Failure of pistons, cylinder liners, piston pins, or piston rings, resulting in loss of original sealing effect, leading to oil spray from the exhaust pipe. 2. Severe wear between the valve stem and valve guide, creating excessive clearance, causing oil spray from the exhaust pipe. 3. If the car's exhaust pipe is connected to the upper part, the issue may lie with the valve oil seal. 4. If the vehicle has just been serviced, residual oil in the cylinder may cause temporary oil discharge, which is normal. However, if oil leakage persists after prolonged operation post-repair, it may be due to wear of the turbocharger's floating bearing seal ring. In case of any of the above issues, regardless of the cause, it is best to leave it to professionals. This process requires systematic troubleshooting, and any errors during disassembly or assembly can lead to further vehicle malfunctions.

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