Hey-I use Marvel Mystery Oil-I add 1/2 quart to my oil every change.  Why?
'cuz my grandfather did and his cars ran forever!

>
> Funny you should mention that. I once had a friend give me a can of
"Marvel
> Mystery Oil", which you're supposed to add to EVERYTHING, gas, oil, darn
> near anything with a fill cap, for all sorts of spectacular performance
> improvements. Of course, it was a sick joke, but it got us wondering just
> what the stuff was...