Here's an excerpt from Schaeffer's Tech Data sheet for one of their moly greases:
"Moly EP Synthetic Blend meets and exceeds the following specifications and manufacturer’s requirements: US Steel 346, 352, 355, 370 371 specifications, Caterpillar MPGM, Komatsu, MIL-G-234C, Case-IH 251H, John Deere, New Holland, Ford M1693A, General Motors, Chrysler, P&H 472B, 472C and 472D, Federal Specification VV-G-632A, MIL-G-4343C, MIL-23549C, DOD-G-24508A(Navy), DOD-G-85733(AS), JIS K2220, DIN 515825, SKF, Fag, INA, Torrington, Timken, Rexnord Link-Belt Bearing Division, NSK, Koyo, NTN Bearing, and Roller Bearing Company of America."
Note the listings of ten ball and roller bearing makers. Schaeffer's promo brochure for their moly greases shows usage in a roller bearing that was incorrectly installed and still lived. Some moly greases use lower quality MoS2, and that might the be cause of trouble in some cases.
Schaeffer's #238 moly grease works fine in larger wheel bearings, but might be too stiff to flow into the tighter clearances in smaller wheel bearings. In that case, one of Schaeffer's other moly greases are commonly and successfully used.
Ken