Best grease for gears?

[NyCityKId]

Does anyone have any suggestions on the best grease for gears inside gearboxes? We recently received the four GEM Planetary gearboxes from AndyMark and two of them came with a whitish grease that seems to work really well and the other two came with this green gunk that was so stiff that the gearboxes couldn't be turned by hand. If the white grease sounds familiar to you could you please tell me the name. Alternatively if you know the of any grease that works well in a gearboxes, we would love to know about it provided it is in accordance with rule <R02> and any other applicable rules regarding potentially hazardous materials.