You went to the dealer for the fix without asking here first, of course they are going to sell you a trans replacement. This is supposed to be a place where we can help. All of us find the dealer network to suck with troubleshooting. For one guy it was just that his fluid was low, another it was a leaky 10$ seal. The turbo I don't know because you saw oil leaking but did you see if the turbo was really bad or it was just a loose ccv pipe? I reread the thread just now and you didn't give proper feed back, the blown off hose could have caused the oil to leak but you didn't try with it back on.... I think these cars are indeed a pain but you jump to accepting failure from a dealer or Indy without skepticism of that diagnosis. Ard, I, and others have seen many misdiagnosed issues here. Maybe it's time to move away from bmw because they are becoming much less reliable, small things look like big failures and so on. Better to get a less over engineered (and badly engineered) car and just get a decent realiable car instead that can also be fast but doesn't need a lot of skills to diagnose or has mechanics and dealers that can and will overcharge/over replace because it's "luxury"