The firm that markets/distributes the product was sued by the FTC over
it's ZMax car product, which is similar ("with Linkite!!!").

http://www.ftc.gov/os/2003/03/oilchemstip.pdf

As far as keeping valves moving, old-time ag-pilots swear by MMO. MMO
is again mostly solvents.

Were I to choose between the two, I would go with MMO. MMO arguably has
broader anecdotal data...

www.pipercubforum.com/marvel.htm