Interesting... I had my 545 in for service due to a steering malfunction warning I was getting. thought for sure there was a leak in the hydraulic system. I asked for an oil change and transmission fluid change (52k,) just because I don't think the fluid could possibly last 100k. The tech found a leaking mechatronic valve sleeve...Hmmm. I wasn't having any drivability issues, perhaps he caught it early? Or perhaps that was how they were able to justify the trans fluid change for me. They didn't find any leaks in the steering/hydraulic system, and my engine oil is dirty and smelly as if they only topped off the sump.
I really wish we could truly trust the BMW service centers, but sadly I don't. I guess I'll see if I have any further problems down the road.