I finally drove the X5 off my property yesterday, for a total of 11 miles. Good road feel, better than any of my other vehicles (as expected, it's a BMW), and filled the tank with premium (haven't had to use premium since the old Chevelle was still streetable w/11:1 compression, on the first 427 engine).

Automatic climate control A/C worked great, with 40 degree air from the outlets, even on a short, slow drive at 45mph in 98 degree heat. It'll probably get colder on a highway run, so I'm pleased with that.

Engine coolant in the middle of the gauge, good, but I want to get a transmission temperature reading (maybe use my Torque Pro, or OBDLink apps for that, on my Android tablet or phone). Lots more things to explore on another drive, soon.

Bonus from the short drive: the immobiliser is now working. Don't know what fixed it (maybe a pinched wire in the rearview mirror? the only thing I adjusted....). So now I must get the key fob backup, since I don't want to be locked out, or unable to disengage the immobiliser alarm, etc. I'll order a couple of keys from oldskewel's link, today, and try his method.

Another item I'm going to try: an onboard charger/maintainer. I use charger/maintainers on all my other vehicles (and trailers), but I have read of the difficulties of getting in/out of the X5 if the battery was to go flat. The doors seem resistant to locksmith's methods.... So, I'll mount an onboard charger/maintainer (IP65 or 67) underhood (connected to the jumper terminals there, power cord (with a sealed A/C supply cord interface) just inside the kidneys), so I can unlock something after a trickle charge.

I'm already using one (not weatherproof), with it connected thru the cigarette lighter port in the backseat, power cord out the door, but it must be removed and stored in the back; whereas on the other cars/trucks it can be tucked under the manual seats, without possibly interfering with the electric wiring/motors/automatic movement? of the BMW's seats.