I have played with some of the "snake oil" additives over the years. There was a company called Bitron.... it wa of course, a network marketing type outfit that pretty much ensured the failure of all of their distributors.... the guy who helped me out with the additives used to give them to me at his cost or as trades for welding, tube bending or other favors.... I never was able to quantify the difference of "before" and "after".... I do know, though, that the gasoline additve, which claimed to have the super slippery compound in it and was recommended for electronic injectors, did give my Corvette a noticeable improvement in the fuel economy - like more than 10% improvement. Whether it was due to the injectors themselves or some unknown oxygenator, though, I do not know.
I did have some of their two stroke oil additive and the gasoline additive at Bonneville one year... I was trying to get Rick Gold to use the gasoline tester on a before and after gasoline sample... I figured he could have told me something about the gasoline stuff anyway, although probably not about the super slippery part of it.... but with the oil additive, I was not able to get anyone from among the competitors with 2 stroke bikes to try it....
The only anecdotal evidence I can talk about with regard to their gear oil additive is that we had a gear reduction unit at the plywood mill that was, due to its design constraints, way too small and, thus, constantly overloaded. We tried many oils and additives. This product brought the heat down from about 160F to under 135F..... the test was all but forgotten about and, 8 or 9 months later, after 2 oil changes and no additive replacement, the gear box was running hot like always though... and then being rebuilt or replaced annually again. And, oh yes, we do use it to this day in our diff and transmission, although I only have enough for about one more application of it.