Lyn:

It appears your mechanic is doing things right.

One comment would be that while you may have driven it enough to warm it up given the miles on it, idling an engine in the cold is not good for it. The engine doesn't warm up as it has no load on it. Not saying that you shouldn't be able to idle an engine in the cold, but it would be far better for the engine to drive it after starting it. That won't help you at this point, but it may help others.

Good luck

Jeff

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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