I've had my 2008 X5 4.8i since Dec.25th. I also had a 2007 X5 3.0si "Launch Supply"...and it was a nightmare. I had the vehicle less than 4 months.

So far, my 2008 4.8i has been great, besides from one visit to the dealership. I kept getting the warning that the battery was excessively draining. Luckily, there was a SIB from BMW, and knock on wood...it's been fine ever since.

The 4.8 is Really, Really fast!! The engine has this amazing, throaty growl. So far, all electronics work great, but the back up camera is basically useless!! It is SO blurry, dark and the colours are odd. At night, it is 100% useless. Sadly, the dealership said: "That's the way it is, we know it's awful...but there is no fix from BMW, sorry". Oh well, the PDC works great, and visibility is good for this size of an SAV.

The only real negative with my X5 is the gas mileage. I didn't buy the car expecting economy...but I never thought it would be this bad!! I am not lead footed at all, but if I can get 10mpg in the city....that's a lot. A good percentage of the time, my 4.8i yields about 8mpg, sometimes 6mpg up hills. Awful. It now costs me about $80.00 USD to fill her up. Ouch!!!