I had the local indy BMW wrench (
https://www.hanswittlerautogroup.com/ ) replace the motor mounts and radius rods in the front end (the rubber bushings were shot) in my wifey's X5. Total bill was about $1100. It sure idles much smoother with the new mounts. I had the work done week before last and promptly drove the X5 to Vegas and back with the wifey for the Thanksgiving holiday with my kids. I got the dreaded 4X4 and suspension inactive warning twice but cycling the ignition cleared it. My BMW guy wants to reflash the entire system (as he put it) to try and fix these intermittent faults.