Hello, I just had a strange experience. Our station wagon has to get a new ZKD. Therefore it is hardly moved until all parts are there and I come to the repair. From time to time I have to drive it just a few meters out of the way. At the same time just the engine started to smoke like crazy. On the one hand it boiled quite well in the balance tank (clearly) but also exhaust gases from the oil filling nozzle. How for God’s sake do exhaust gases come there? Do I have to fear to have lost a piston now too? VG Mathias