Hi,
tj90 - Everybody is entitled to their own opinion and of course some will be tempered by their own experiences - as mine are!
I have been down the additives path many times over the last few decades. Graphite, silicons and a variety of others. I visited DuPont Chemicals (Wilmington Head Office) in 1989 concerning Teflon in lubricants. I have sat in many meetings with engine development Engineers - for a number of Companies
I have in front of me one of two 1Qrt containers of "Mark-10 10W-40 grade oil with Micronized Molybdenum Disulphide" from "National Chemsearch". National Chemsearch was based in 2727 Chemsearch Boulevard in Irving, Texas.
The label states "Mark 10 physically plates itself to metal parts, grooves and pores to create a low friction surface that resists removal by mechanical shear and chemical attack"
Some quantity of these were given to me in 1980. They were supplied for trialling! We did try them - and they were not cost effective in the real world! Mnay have passed by in the interim!
IME none have been truely cost effective as supplementary additives in engine lubricantion. Some are great as component assembly additives, Some work in non engine applications
Do Oil Companies try them? - yes. Do some of them work? - yes possibly, and to one degree or another. Do modern correctly specced lubricants need them? - No IMO.
Do engines need them? - No IMO
Liqui Moly who make the Lubro Moly products is a reputable supplier. Some of their excellent finished lubricants have official VW-Audi Listing. Some meet Porsche and MB specifications. The one product that is "moly" intense does not
I think Liqui Moly is also on the lubricant supplier list of some German engine makers
All that said, I will not be using any supplementary additive in my engine oils any time soon - but that's just me!