White smoke out the exhaust is ONE THING ONLY -- a leaking head gasket... one way or the other "water" - which turns to steam - is in the cylinder and being heated... and going out the exhaust...
It could also come from a crack - but my guess is the gasket - since they just changed it.
Don't bother with these morons - they're ripping you off AND doing crappy work! Hope you have another dealer in town. I'd be calling the DISTRICT REP and getting him involved... they owe you some favors now! Like a rental - and good work...
By the way -- BMW can have crap service too... trust me... I own a new M5 (although just sold it) and own a 650i Convertible... and we've had issues with service and the cars. BIG DIFFERENCE is the respect you get when you do have an issue. You don't have to yell and get pissed off - they WILL make it right. But that's not the issue here... so good luck with your problem. That sucks.
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