^I believe discussion here is M62 related. Post above yours was concerning a 2002 4.4i.

mbzgurl... It sounds like time for a tensioner has passed and it is time for that engine to get the guides themselves. Fairly costly expense if you aren't doing the work yourself. Might steer clear of that particular X5.

Edit: mbzgurl, reading is apparently not my strong suit. You already bought the truck. In that case, probably going to be an expensive trip to the indy mechanic. I think the job runs about $2000 +/-. But, you could have them drop the lower oil pan and inspect the guides. If everything is intact put a new tensioner on it and cross your fingers. Best of luck.

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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)