“I wonder why some motor oils have only 20-30ppm and some have 500 to 600 ppm. From a chemical perspective, it's fairly harmless. It's everywhere in the ground, soil etc.“
Different forms of moly just like there are different forms of any mineral.
Trinuclear Moly needs less to accomplish the same effect as the moly disulfide.
+1 If i understand it correctly, the trinuc moly converts to mos2 at the point that boundary lubrication comes into play. And you don't have to worry about additive dropout.