dieletric tune up grease looked real similar to what came with some of my bushings, there little pack ran out and thats what i used with no problems. Just make sure the entire internal and external surface is wet with it.
The grease that they sell in the Prothane kits is special. I'll try to figure out who they use, but I can tell you it's different. It doesn't squeek and it doesn't wash off and it's clear.
I would think you would want somthing that doesn't wash off. I am interested in knowing what type of grease that is that comes with the prothane kit comes with