Are you a self lubricator?

[rodster]

So I looked in the owner's manual for a grease recommnendation and found it. Problem is, the GM spec numbers don't match anything at the parts store.

I found grease in blue (lithium generic), red (don't know what's in it) and black (graphite + other ingredients) cartridges. Any suggestion which is best? And is the warning on the grease cartridges about not mixing grease types to be believed?

Thanks much!