In auto shop, we were told that a car should be run at high rpm routinely enough to remove/prevent a hard wear edge in a cylinder, which could then present a ha

In auto shop, we were told that a car should be run at high rpm routinely enough to remove/prevent a hard wear edge in a cylinder, which could then present a hard limit if the that car was once, rarely, run at high accelleration/power. I recall a reference to the piston rods stretching more at higher rpm. So you don't want to buy the used car "which was only driven to church on Sunday."