Definitely rent winter tires. It'd be a waste to not have the chance to drive the car!

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2008 535xi 6-speed - Blk Sapphire, ---2011 535xi - Jet Blk, Blk Dakota,
Blk Dakota, Bamboo Prem | Cold Wthr -- Aluminum | Prem | Prem 2 | Cold Wthr
Sport | iPod/USB | Nav | Sat --- -------Sport | Sport Auto | Fold Down Seats
Fold Down Seats | Htd Rear Seats -- ---Side/Top Cameras
PDC | 18" wheels | Logic7
(Good riddance!)