operating hours below normal operating temp. That's why cop cars, taxis, industrial engines and other stuff that doesn't get turned off very often frequently lasts well beyond 200k (or the equivalent number of operating hours) wheras something used for a 5min drive to work and back every day will be worn out in much less time.

This is assuming all other variables are consistent. Changing your oil every 10k vs 5k certainly won't help things.