ED , I don't think you have been answered yet.
Most all of the statements made so far are correct and I agree with them...particularly with using way oil ..But !
Molydisulphide has some unique properties and can be used to get this advantage.
Forget all the sales hipe..lets look at its good points.
MDS will "plate " a surface and give extrodinary low friction results *.
Its anti-galling abilities are without question!
It will also "ball", "clog" and do other nasty things....caused by a loss of carrier (oil/solvent)
It is a mess to keep clean as well !
It is a dry or wet lube, depending on application.
For high temperature chain lube (400 to 500 F)it is superb..
But To The Point !!
To get the plated characteristics, the metal must be virgin and clean,clean,clean, so here is a course of action.
Freshly machined surfaces (without coolant/oils)are perfect. anything else must be spotlessly clean...I am talking about abrading the surface with Wet/Dry paper and lacquer thinner and removing ALL oil !
Now lube the mating surfaces with dry MDS and slid them together...almost like a lapping function for a period of time ( 5 to 10 min)
This allows the MDS to penetrate all pores of the surface.
Under an electron microscope, an actual plateing appears as the MDS adheres to the molicular stucture of the bearing surfaces.....this is what produces the lower friction characteristics!
Now you can either leave the residue or wipe it off,and apply a good way lube...
The company I worked for had over 100 high speed 40 ton punch presses( fine blanking) and cross head rebuilding became an art form with us.
We had Cast Iron crossheads with both Cast Iron and Bronze Gibs/Ways.
The above procedure I described almost tripled the life of a crosshead, while just adding MDS to an existing running "set" maybe added 15 % to the life...not a cost benefit ratio we wanted.
It took a little longer to rebuild, but we had cooler gibs and tighter tolerances.
Hope this helps Ed
Rich