I don't personally. But I've seen on tv a high end restoration guy trying un-seize an antique Rolls motor and they put the stuff in the cylinders to soak for a couple of weeks. In this case it didn't work, but this is a typical use for it.
Way back when I had a 1950 Harley panhead I used a few ounces in every tank full of gas to quiet lifter noise. Worked great. I've also poured it into spark plug holes of engines that set too long and added it to the crankcase of old worn out engines. It seems to help. Then again some call it snake oil. But I've never had a squeaky snake so don't know.
It is mystery stuff. I tried it in a 29 Ford roadster I bought, that had sat for 50 years. It didn't work. I put some in the 289 Studebaker engine in my 56 President wagon, and it broke free......and is now powering a Studebaker pickup. I didn't want to build a log haul hot rod with that engine, so I had a 350 Chevy built.......one that I could get parts for across the counter, anywhere in the country.....
That's the real mystery. Sometimes it works and other times it doesn't. It's not bad on pancakes when you run out of Aunt Jamima or Log Cabin!
