One thing I've noticed on my 4.6 is that downshifting in Sport Mode is harsh, so I only put it in Sport Mode if I am accelerating. If I'm about to hit the brakes or let off the gas I will jump out of Sport Mode first. Not sure if this will 'prolong' the life of the transmission but the car seems to complain a lot less. just fyi

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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels.