To heck with the additive, I want to know what oil he used for the last 400,000 miles and how often he changed it.
"I COMMUTE 90 MILES ROUND TRIP EVERY DAY IN MY OLD 93 THUNDERBIRD V-8 THAT HAS AROUND 400,000 MILES ON THE ENGINE.I ADDED A BOTTLE OF PX3 YESTERDAY,BEFORE I DROVE HOME.AFTER A SHORT TIME, DRIVING AT 70MPH , MY RPMS HAD DROPPED BETWEEN 150-200 RPM’ I COULD NOTICE AN INCREASE IN ACCELERATION AND IT SEEMED THAT THE ENGINE WAS RUNNING QUIETER.I REALLY NOTICED THE REDUCTION OF ENGINE SOUNDS AS I STARTED THE CAR THIS MORNING."