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xDrive is okay. I haven't had any problems and we have much steeper hills in WA than I did when living in CT or VA. However, winter tires are a must and most all modern AWD vehicles rely too much on wheel spin to get traction aids (ETC or LSD's) to kick in. I also suspect that the newer G30 M550i with the M Sport Rear Differential will perform slightly better than G30's with full open differential.
The biggest problem with our G30's is weight. It's your worst enemy in snow despite common thinking. Inertia is a bitch to overcome when you're trying to change direction (or velocity) in the slippery stuff.
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