I know what you mean, that's why I specifically said known issues. I'm not going to replace bearings just to replace bearings, but overheating and it's associated culprits being the valley pan, radiator neck, expansion tank, etc are so common that those are the items I chose to change on a mileage interval vs just waiting until they pop since 80-100k seems to be about the average for these items based on experience and/or reading.

You've brought up changing the spark plugs about 2-3x now. I'm not talking about spark plugs being prematurely replaced as I only do them every 100k if stock parts and 50k if non-BMW purchased. You say it's still got plenty of power, but ask an E39 M5 owner or just spend some time on the boards with the guys who replaced their MAF's on a regular mileage interval. I promise you that you'll find threads stating how they never realized how down on power their car was because, just like spark plugs, they're a resistance type wear item, so their performance disintegrates over time. My point is that I'm more on the cooling system and just about any other fluids in the car since those seem to be the most neglected items, which inturn lowly degrade other items. People don't flush their coolant enough, they get clogged radiators, heater control valves seize, etc. I worked at a shop who did quick and dirty brake jobs, aka no flushing of the fluid. They could have taken another 10 minutes, maybe made another $40, making the car and driver better off for it.

__________________