How is the Passat exhaust pipe leaking oil?

When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will leak into the crankcase through the gap between the piston and the cylinder to some extent, resulting in blowby. The components of blowby are unburned gas, steam and waste gas, which will dilute the engine oil, reduce its performance and accelerate its oxidation and deterioration. Water vapor condenses in engine oil, which will form sludge and block the oil circuit; The acid gas in the exhaust gas mixed into the lubrication system will lead to corrosion and accelerated wear of engine parts; Blow-by will also make the pressure in the crankcase too high, destroy the seal of the crankcase and make the oil leak.

In order to prevent the crankcase pressure from being too high, prolong the service life of engine oil, reduce the wear and corrosion of parts and prevent engine oil leakage, crankcase ventilation must be implemented. In addition, in order to meet the increasingly stringent emission requirements and improve economy, the crankcase ventilation system must also be designed in the process of automobile engine design.

The above problems can be solved or alleviated by installing crankcase ventilation device in the engine.

If the piston, piston ring and cylinder liner are seriously worn. It will cause a lot of compressed gas in the cylinder and high-temperature steam of engine oil to gather in the crankcase, and then be sucked into the intake system through the ventilation pipe, so you will find that there is engine oil in the intake pipe!

Suggestion:

1, not serious, always clean the throttle and air intake.

2, serious, need to replace the piston and cylinder maintenance!