The Stovebolt Site Forums The Shop Area General Truck Talk Had more than one mechanic tell Me.......

Back in my teenage years I poured many a can of Casite down the carburetor of my dad's '65 Ford. I enjoyed the challenge of pouring with one hand and keeping it running using the other hand on the carb linkage. It was fun making all that grey smoke, and I liked the unique smell.
By the time I got my first car, luckily I had realized I was just pouring cash down the carb for no benefit. Did use STP in the oil for a coupla'three years more until I wised up and concluded additives were nothing more than "voodoo mechanics".