I've left previous BMWs (not yet with the X3) for up to 6 wks at a time and not had any trouble. The only things I noticed were that the comfort access seemed to have disabled itself until I opened it with the key once, the tires seemed to hold a bit of a flat spot for about a mile, and the first application of the brakes was a bit grabby.
Now, others may be able to tell you I would have been wiser to hook it up to a battery charger, or something -- in this case, 6 wks wasn't long enough to create a problem with the fairly new battery in that car. If I have to leave this one longer, I was thinking about asking a friend to drive it for a day every three weeks or so.
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