Miles. Engine is starting to show it age. I have lowered compression in cylinder 2. Still within limits, but I've started looking for another X5 with lower mileage. They're out there, but not necessarily in great shape. Looked at one with 76,000 miles on it and my body and interior were in better shape. I'll be going to look at one about 2 hours away next weekend. From the photos it looks good. Only has 127,000 miles.

I'm also going to borescope that cylinder and see if it looks like its valve or rings. If rings, I'll try a ring soak and see if I can get the compression back up close to the rest. I hate to get rid of it. I've had it so long and it's been a great car, still is.