I've had my 540i for 4 years now and have always garaged it during the winter and driven a beater until spring. With a second baby on the way, for safety reasons I think I'm going to drive it all year round. I bought the wheels and tires (Alpins) but still have trepidation about ruining its good looks and remembering back to my mom's station wagon with rear wheel drive in the winter. When I was in Bavaria I saw tons of 5 series in the snow and figured they have to be an ideal winter car. Should I keep the beater? Thoughts, suggestions?