You will notice I called it a SAV not a truck---however-
Elaborating, my point is that the X5 is much heavier, higher center of gravity, etc. than a "car". As an example, Automobile magazine would compare the Porsche, Mercedes, Land Rover and the Jeep SRT versions of SUV/SAVs rather than the X5 with the M3 and the C class AMG. There is no measurement that makes sense including the total cost per mile comparing a SAV to a "car." AquilaBMW is accurate, the only logical overall comparison is to the category of SUVs.
I do think that keeping with recommended maintenance schedules or even sooner for the X5 are more critical than a "car." If one doesn't it will lead to much more expensive repairs sooner than lighter, lower, used differently, vehicles. The same would be true of other vehicles in the SUV category.
(The following is an exaggeration used only for clarity) By abuse, I mean by those that were status buyers or used the X to haul their two children to school and to their 16 activities each week. The only scheduled maintenance done was under warranty, after that--natta. They drove it 60 to 70,000 miles and traded it in the first time they had a significant problem, or, to buy the new face lifted version. These X5s become part of the group of used X5s purchased with unknown history--a very critical purchase error relating directly to ongoing reliability. Simply--hit yourself in the head with a hammer until you would never consider taking that route.
If there is anything WORST, it is that this thread was ever started.