Drove the Z a few times this past winter in Winterpeg. Had it shod with Pirelli run-flat snow tires on 17" wheels. Seemed to be OK. No issues with the windows, but then again, it was so damn cold that moisture didn't have a chance to set in and freeze.
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)
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