Good winter tires on RWD = no problem. Take if from a former Calgary based BMW owner since 1987: '76 2002, '80 320i, '88 325is (LSD), '90 535iM, '00 323ci, '91 M5 (LSD). Never was a problem - many was the time leaving FWD cars spinning helplessly or watching them hit curbs.

 

I drove my g coupe RWD all winter last year. Other than the first bit of ice on the roads where I was nervous about hitting curbs, I had no problems! Like Swivel said, you just have to think ahead and be aware. The traction control does a good job of keeping you planted but black ice is still black ice. Deep snow can be a bit of a problem but if you don't go into deep snow.......I actually find my G couple better to drive than the old Chevy Avalanche that I used to have in the winter.

 

Happened to me last year, won't happen this year, the deed will be done on Monday. Would like to wait a bit more (after all it was 16C today), but I'm not taking the chance after the experience of just barely making it home.