The oil loss is still bothering me. Most of the oil is coming out of the 4th main bearing at the transmission output. I am constantly under the car wiping the oil off the transmission and oil pan. I still can't understand why this wasn't a problem for the first 1000km.
First I check the oil level. 4 liters of oil are too much. Now I want to see how much is still in the engine. According to my scale, there should be 3.5 liters left. If it runs out of the upper screw on the gearbox it is too much. If nothing runs out, that can't be the fault. On the sight glass can not be seen very clearly.
No oil comes out after unscrewing. So the oil level is not too high.
Tatsächlich sind die beiden unteren Schrauben ziemlich locker. Ich konnte sie 2 Umdrehungen nachziehen. Die beiden oberen Schrauben sind fest. Das könnte jetzt verhindern, dass nach Abwischen noch Öl austritt. Es wird aber nicht verhindern, dass das Öl am Kardan herausläuft.
I took this photo after I parked the car and wiped the transmission output. Half an hour later, oil has leaked from the sealing surface. Now I check if maybe the 4 screws are not tight anymore.
In fact, the bottom two bolts are pretty loose. I was able to tighten them 2 turns. The two upper screws are tight. Now this might prevent oil from still leaking out after wiping. But it will not prevent the oil from leaking out at the cardan.
Next I will park the car backwards in the garage. Maybe that is the reason for the oil leak. The car is always parked front up in the hydraulic garage. There the oil could run over the 4th main bearing into the cardan housing and then leak out while driving. This could also explain why the oil leak did not occur the 1000km. I had not yet parked the car in the garage.