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High miles could cause it. But its more about how good the turbo's inner bearing is and how you shut off the engine after driving the car hard. Like so many here say you don't need to let the engine (idle) cool down after hard spirited driving - its always a good idea to do so. I'm not saying thats what you did - I am just saying thats how old turbos would die. This is why I like to change my engine oil frequently and sooner than BMW says too.
I know BMW changed the wastegate shaft(size) on the later built cars (~2009 or so) onwards builds. Maybe they also changed the turbine's bearing size too. ?
I find it very odd that your turbo failed while at your indi shop. Maybe they drove your car kind of hard on a test drive?
You can buy a new turbo from any of the forum sponsors here for about ~ $600 each. Good luck with the repair.
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