Just don't use summer tires. I was in all-seasons and played around in the snow, purposely trying to slide out and the traction control did a good job. 24MPH was a simple task. I drove on the highway at the speed of the rest of traffic also with no problems... just don't do anything abruptly. When you say 20s people automatically think summer tires (OEM setup) when you can very well change them out.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr