My 2010 x5d has 242k miles on it. Suspension is feeling the wear, and it could use a $1300 front end refresh of all arms and bushings, springs and struts. I have normal rear suspension. I offroad my X5 some, and I tow a LOT with it. I deleted and tuned at 213k miles.
I've driven my X5d like 38k miles in 11 months, and havent had any real issues.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years