Our 2007 X3 does fine in -30, and did fine on our last trip to Calgary as well. They can be driven in winter. Your dealer service department just needs to get their act together and find the problem. Good luck.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue