Ok. Guess I always gotta be different...again. I run a 160* year round. Temps normally run 170-175 all the time. A bit higher when the ambient temps are 95* and above or if sitting in stop and go for more than 45 minutes.

Someone explain to me why a cooler engine wears faster. Friction is what causes wears and more friction creates more heat. Less friction, less heat. I get that motor oil needs to be a certain viscosity to lubricate properly and is a function of how warm it is but not everybody runs the same grade or weight so I don't think you can generalize on the basis of oil used.