my 850i was struck down by the wizard of winter too.
its electronics would not work in the cold and all 4 hood/trunk shocks failed and had to be replaced. Its odd what the freezing cold endured for a while can do to machines/equipment.
My X5 came out rather unscathed except for CCV's needed replacing and cold start issue 2-3 times...
I wish we'd move to a warmer climate soon!!! I don't ever want to have to own winter and summer wheels/tires if I can justify it.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S