Hey guys, just a thought...I know you're not supposed to go sniffin' the exhaust anyway, but what do you suppose the by-products of combusting teflon would be??? Not good I'll bet, and would make getting a lung full of exh. a bit more hazzardous, wouldn't ya think?! You wouldn't be running a mix of it in the fuel tho, right? Just a periodic application? My car seemed to run smoother after using prolong though...Hmm...Maybe use a "disposeable" used plug for the application, then switch to a good plug. Might be worth a shot?! Tach it before and after...