One of the features I like is the "rest" feature with the heater. When it's cold out, I can run into a store for 10 or 15 minutes and come back out to a toasty warm car. I think the e53 had this too, but for some reason I just discovered it on the e70. Maybe because we had such a miserable winter this year...

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2007 X5 4.8i Space Gray
2001 X5 3.0 Titanium Silver