I know nothing of Moly in motor oil .
But I have used powdered moly and moly lubes quite a bit , won't scuff steel at all . Under pressure ( like metal on metal , not between your fingers ) moly squishes and lubes .
You could mark up a crankshaft bearing with your fingernail , or a plastic spoon , or ... you get the idea , they are soft and the satin finish makes the slightest mark stand out .
If moly was abrasive to steel it would not be popular as a bullet lube ( up to 65000 psi , 4000 feet per sec. , and kinda warm too ... ) Actually , recovered copper jacketed bullets show less scuffing with moly than without . Barrels have also been said to last longer with moly . Bullet lube is typically straight molybdenum disulfide with a wax coating to make them less messy .
Like I said I know squat about moly in motor oil .
Just .02