Originally Posted by Boulder Bill
You don't really need X drive, but you should get some winter wheels/tires for snow use. I drove a 540 with rear wheel drive for 9 years here in Colorado and was only slowed by deep snow - not enough clearance. And 4WD wouldn't have helped with that.
I drove my 550 six speed in the snow today and it did very well. Have fun!
Concur on that. I had an e92 M3 which I drove in snow for a whole season using Dunlop 3D Winter tires without much issue. Currently have a F10 550i and Michelin Pilot AS tires and was able to get around in the most recent snow we had here in Seattle w/out much difficulty. Traction Control Off setting helped a lot too. But didn't need X-drive although like you I wondered too IF I should have checked that box when I purchased in Aug too. Winter tires/wheels are the best option...in fact in Germany they are mandated in order to even drive in the winter season. Get a set and you should be fine.