Omodos, my own X had a bit more than 1 deg negative camber in the rear when I got it at 20,000-something miles.

Over time and a few front suspension repairs I noticed the rear camber drifting towards the far end of spec. I could not adjust it back as well. Visual inspection of rear suspension showed only torn ball joint boots.

Lately I had to replace the rear wheel bearings and so had to remove the rear upper arms. Their bushings were intact but deflected inwards, pulling the top of hub inward and causing excess negative camber.

Replaced both upper arms and now rear camber is now adjustable back to low end of spec, about a degree and a half negative.

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04 X5 3.0i auto
03 X5 4.6is