What is the reason for a lot of engine oil inside the PCV valve even though it is not broken?
2 Answers
There is a lot of engine oil inside the PCV valve even though it is not broken because: engine oil vapor condenses when it meets cold air. Turbocharger issue: If the vehicle is equipped with a turbocharger, the issue lies with the turbocharger. For non-turbocharged engines, the problem is with the valve cover, which needs to be replaced. Due to prolonged imbalance between the intake pressure and the pressure inside the turbocharger bearing housing, engine oil inside the turbocharger leaks into the compressor under the pressure difference through the seals. Intake manifold: The intake manifold is the passage through which air enters the engine block and flows toward the cylinders. It mainly consists of channels designed in the cylinder head. At the very end of the intake manifold is the intake valve, which controls the air intake.
I've seen this situation many times where there's oil in the exhaust gas recirculation valve but the valve itself isn't faulty. The main issue lies in the crankcase ventilation system. When internal engine pressure is too high, such as when piston rings are worn, oil vapor enters the EGR pipeline and accumulates in the valve. If the turbocharger system's seals are leaking, it can also allow oil to seep through. I recommend first checking the crankcase ventilation hose for blockages or damage, as this is the most common cause. Engine oil overfill or using oil with too low viscosity may also exacerbate the problem. Regular replacement of the PCV valve and monitoring oil quality are crucial - otherwise, prolonged neglect can contaminate the entire system and even damage the turbocharger, affecting acceleration performance. You need regular maintenance and should have a professional technician use specialized tools to check whether internal pressure is normal, which can prevent problems before they occur.
