I had changed coils as first attempt. I finally did compression test and only 30 pounds cylinder 1 50 at cylinder five. Is it valves or rings not sure. Exhaust is clean but blow by is outrageous so I think its rings. But the Jerry rigged center support bearing started squeaking and new noises. Took a look and the bearing failed from the vibration. Pink grease leaking out. The drive shaft situation. So X5 parked in storage unit to attack the driveshaft problem again. So from the time the rubber failed around the bearing to the bearing blow out was about 1200 miles. Despite the rubber hose and twist tie emergency fix. Sort of amazing.