R53 loses oil in engine compartment

Moin! I’m so desperate. The last 3 – 4 times the TÜV sent me to the workshop because the engine loses an excessive amount of oil. I have to admit that I’m still blue-eyed directly at BMW, and more about it. The TÜV’ler is always more like this: “So that won’t be a big problem. A seal or something, once, and then you probably have years of rest.” In the BMW workshop, for example, it runs like this: “We have it, it’s the oil tub gasket, the “Now we have it, it’s the engine cover (or similar? sorry, know me too little). Is a bit more elaborate, but then you have rest” Done, 1 day after that the clutch mysteriously is completely broken. So again workshop “By the way, your engine loses oil. That’s definitely the oil tank that needs new.” I: “Did you just make a new one last week?” – “Oh, then that’s just rest oil” De facto they have been repairing themselves since big b 8 years rich in the oil problem. However, 2 visits to free workshops were also similar pan. Before I become a general skeptic towards workshops, I think that’s wrong – would I need advice. How do you do that most cleverly? Do I simply blindly test other free workshops? Does someone possibly have a trusting tip for minis in Hamburg? Or does someone have an approach to the oil problem, or how do I deal with the workshop more precisely? Thank you already.