Had run a 850 TDI 96er a week ago with torn off screws at the main bearing docks on stage ! ~350,000km, rougher / unround motor run for a long time. For troubleshooting was pretty much everything checked / changed what was possible. (pump, all engine bearings, vacuum hoses, injection nozzles incl. needle lifter etc.) At the last start the engine suddenly ran extremely rough, vibrating from 2000 rpm very strongly. At the stand suddenly a loud bang and strong oil loss. Mo The oil tank had a big hole and a screw of the main bearing bulge was on the asphalt. After dismantling the oil tank (SWINE WORK) the damage was nice to see. On the fourth bearing bulge a screw was torn off, on the fifth one one was torn off, the second one probably turned out. Lt. Information of a friend AUDI mechanic this is known by the AEL motors. Supposedly there are changed screws (higher strength) at AUDI. After my forums the damage occurs. The oil tank is not as deep as in the rest of the area. But I can’t imagine that this has something to do with it.