Your price is going to leave you looking for a buyer for a loooooong time. Not that it's an unreasonable price. Just that the market for 15 year old BMW SUVs that are maintenance hogs is a small one to begin with. Have the valve stem seals been done? Then add the premium you're asking for low mileage. It'll be awhile.

Have you looked into those auction sites? Still probably your best bet.

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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)