one big factor, unless you lease, is X6 will be redesigned next year. But again, with Adrian Von Hoydonk it's hard to say if it's going to be a hit or a miss. The X5 is just redesigned so your car will be new for 6-7 years.
I owned a 1st gen X5, but with X6 for some reason being less common I got high-beamed twice by a fellow X6ers. Kinda cool, like those hogs rider lowering their left hands when passing each other on opposite lanes.
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