Eseries Crankcase Ventilation Issue

Greetings. I have an Eseries too, although not the same year. The symptoms you describe are similar to an issue I encountered some time ago. If your mechanic is right, the PCV (Positive Crankcase Ventilation) valve is the likely culprit. The PCV valve is designed to relieve pressure inside the engine's crankcase, preventing oil leaks and other problems. If the valve is defective, it will cause the engine to burn oil, which creates smoke. Did your mechanic say anything about checking for leaks?

Thanks for the quick reply! No, he didn't mention checking for leaks specifically, but he did say something about increased pressure in the engine. Is checking for leaks something I should specifically ask him about?

Given the symptoms, it would be prudent to ensure all possible causes are evaluated. The increased pressure, if verified, does reinforce the suspicion of a faulty PCV valve. However, a thorough inspection for leaks is always advisable to eliminate other potential issues. It might be best to take it to a workshop. In my case, the repair cost me around 360€.

Thanks a lot for the advice! I'll definitely ask him to check for leaks as well. I appreciate the insight. I'll let you know how it goes. Apparently the crankcase ventilation was defective indeed and I got it repaired.