I have had my first CS4 apart. My grease pot was about empty without me going twist crazy or anything like that so I had to investigate. The yellowish grease that matched what I had seen in the grease pot, was inside the crank area and a white grease was inside the cylinders.
Two very distinct and different greases. I have no idea where the grease pot grease is supposed to go, but after seeing the same grease pot colored grease all over the crank area I made the assumption it went there.
When I put mine back together I cleaned the pistons well and lightly re lubricated with the EP recommended grease (food grade) grease that would make sense inside cylinders as it won't detonate and can withstand high pressure and temps if it has to. This grease would also make sense inside the grease pot if it in fact lubes the crank so I filled the cup up with it there as well.
I took a peek inside just to be sure things were working as they should and all was well after another 2.5 hours on the machine.
As I said, I'm not 100% sure what grease goes where, but either the factory dumped all the yellow grease into the crank case, emptied my grease pot so it wasn't full, and lubed with a different grease in the cylinders by mistake, or this was the way it was designed. And I am not 100% sure which is right.