[dfink]

Best lube I have found for anything rubber was called Archer Professional Gel Lube with teflon. It was from radio shack. I ran out and couldn't find it anyplace then I ran across it at Harbor Freight. It is now called Super Lube Professional gel lube with teflon.
I used it on all the o-rings during assembly. Recently took a case back apart and every one of the through bolt orings were in one piece. Works very nice on the oil return tubes and is the greatest thing ever for getting the rear spring plates to go into the torsion tube. You can literally just push them in. The stuff kind of drys up and the rubber takes a set just like it should.