I've seen MoS2 settle down (as sediment like stuff) at the bottom of the oil pan in the early 90s (Molyslip was what I experienced before, with some customers did that also), which, while perplexing, led me to believe that excessive Moly in oil (in the form of OTC additive, not actual blend into oil as part of the chemistry) may not be a good thing afterall.
I not lay my faith and believes in properly formulated brand name motor oil, not just some oil or magic elixir blend that people are known to do here on BITOG and then claim bragging rights about. If thinner oil is used: I'd rather buy lower viscosity motor oil and use it 100% instead of cutting it down with some wahla-wahla stuff which claimed to be magic to all things.
Motor oil, the way I see it, is now better/more robust than ever. I see some OTC jack of all trades stuff will eventually go away into history....but then again: who knows? There's some hardcore old folks who claimed that such OTC products still has place in modern automobile technology, including curing ticks....or whatever you like to call it.
Oh well, rant enough already...back to lurk mode.
Q.