Wilson combat has a product called the Ultimate Lube. I know it sounds like it should be sold in a brown, unmarked paper sack, but this stuff seems to work very well.
On one of their CDs he (Bill Wilson) tests the product against the better well known lubricants using a loaded bearing machine. All the lubricants used showed wear at the bearing surface when loaded with 5-10 lbs of weight. The friction was great enough to stop the rotating bearing surface.
The Wilson Ultimate Lube did not stop the rotation, or show any wear at full weight. Surprised? I know some are saying "snake oil"
product, but it does seem to work well.
I was going to supply a link to the product but their server appears to be down at the present.