Isn’t machining done by programmable robot machines? How do they get it wrong? Incorrect programming?
Poor design. A V-8 engine is not designed to run on 4 cylinders.
Not sure about the validity of this but I read that manufacturer’s, in an effort to meet Federal mileage standards, have begun using much tighter clearances, lighter viscosity oils and no use of zinc or phosphorous. EPA str8kes again.