I first saw/discovered it watching some projectfarm youtube vids back in the day. He built a test device for testing oils with input from an industry engineer, is pretty meticulous and doesn't do product endorsements or take sponsorships. BestLine in the test, mixed with oil, trounced the just straight oil then performed admirably in a run dry test. I figured I'd give it a shot and it did appear to have a noticeable effect. Oil is lighter at change interval too (notwithstanding the major difference I later encountered running mostly E85 to save money). My AFM lifters never complain, engine (532K now) purrs like kitten as long as I don't let the plugs get eroded down to the electrons having to abseil across the gap...
The newer formulation has nano size (~4-6 nm) diamond particles in it. Still using it. I should probably save some at my next change to get an analysis for tribe Geek here...