As safe as the E53s are, on a 4.8is you have to be meticulious about maint and give it that special touch us DIY guys on here do, that a 3.0 for example doesnt need as much. Ontop of that depending how the girl is the car will likely get trashed as they dont know what a 4.8 is... Would hate to see that.

4.8 for a 16 year old learning to drive is a bit ballsy of a car as well.. Once she learn what hitting the gas on this does their gonna be flying (although hey not a bad thing as i hate the shits who do the exact speed limit or 45 in a 55 lol!)

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2006 X5 4.8is Fully Loaded