Heavy oil loss at 10km

Hello, I looked at a ́96er 850, 2.5 10V, 290tkm. He actually made a pretty good impression (car body and interior). Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa but from a further journey urgently. Lt. seller he had driven 10km to the TÜV and back, TÜV new! However, only one stamp in the devalued Fzg.-Schein (deregistered according to TÜV) test certificate / receipt was not available. Thus the car could never have come over the TÜV. So: TÜV stamp “bought” or actually sudden oil loss on the 10km return trip from TÜV? What could it be? ZKD so suddenly? Greeting Philipp