Hah! LOL, shows how my brain works. I changed the "maintenance" in Jay's post to "mods."

Maintenance is much more appropriate. How about the transfer case actuator gear? Did the 4.6is have issues with the front prop shaft only being in the transfer case a short distance and wearing out? Perhaps take a look at it and grease it, or if it looks worn order the longer version.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)