SteveF for your edification -
ad hominem argument, also known as argumentum ad hominem (Latin: "argument toward the person" or "argument against the person"), is an argument which links the validity of a premise to a characteristic or belief of the person advocating the premise.
To wit - your linking of rotating a piston engine against the DOR and effect on airpump carbon rotors. to the current discussion on oil cans.
Cheers
BH