Australia has had the diesel X5's since the very first model release, I have the second generation E53 diesel sports, it has done 75,000klm, bought it new in Jan 2004. My new X5 E70 diesel arrives on the 10th June 2007.

I use 9.4 ltr per 100klm city driving (that around 1000klms per tank), counrty driving I get close to 1250klm from a tank, I drive pretty hard (just put new brakes, rotors & 19" tires on the X5 at 66,000klm), the diesel produces around 500nm. I have saved over $3,000 per year in fuel costs compared to a V8 X5 and have services less often with a diesel as well.

The re-sale value of the diesel X5 is much higher than the V8 X5. I currently get diesel fuel $0.06 cheaper than unleaded petrol. I also believe the diesel X5 sports handles better than the V8 because there is less weight over the frontend. The new E70 diesel motor now is even 25kg lighter again (55lbs), 8% more fuel effiecent and with 7% more torque (520nm)

The V8 maybe quicker off the mark but if you look at the diesel time from say 30kph to 90klm its just about the same as the V8. So on the highway passing cars there is no difference between the two.

If you are thinking of buying a X5 E70 and the diesel is coming to the USA wait. Otherwise still wait because you will be able to buy the V8's cheaper secondhand once the diesel is released.