I bought a 2004 X5 4.4i locally on Labor Day.
Miles were 86K.
The car showed well but had some quirks.
Battery was 4.5 years old and not healthy.
The rear air suspension wasn't working and had a dash message.
The dash lights flickered and were on all the time with the key in ignition.
The tires were okay, but a sidewall plug repair (big no-no)
The car had a previous owner funky smell.

Anyway, I bought it for 6200 dollars.

1) replaced 30 amp fuse on air suspension.... X5 rises up, dash lights out! (Biblical moment)
2) found a short in the telephone wiring system. Problem was in the center
console flip up lid. Repaired and no more flicker in dash lights.
3). Replaced battery, new Interstate
4). Replaced the cabin air filter and no more funk.
5). New set of Michelins !!!!!!

I had both front and rear bumpers repainted along with the hood.
I also installed a front "skid plate" painted matching silver.
Had the rear bumper lower valance painted like the other guys have done.
I installed front and rear mud flaps also.

I honestly think the previous owner got spooked and dumped it.
This Forum and previous 5 series experience fixed this car right up.
I would drive it to Boston today.
My other BMW is a 2000 528it wagon.
I spent crazy money fixing up that car.
Rather be in the X5 from here on out

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2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift