I've heard Moly plates out in high speed applications. I had a guy tell me anything spinning faster than 1800 rpm would plate out and I'd roast my bearings.
I know normally a moly grease does not carry the wheel bearing (GC) NLGI approval, but are there any that figured out how to run Moly in a high speed application that got the GC-LB approval?
General rule of thumb I use for what I know is this:
Lithium: Good general purpose grease
Polyurea: Takes heat well
Calcium Sulfonate: Resists washout better
Moly: Handles heavy shock loads better