Well, I came across some instructions for assembly/disassembly of these Currie Johnny Joints and the instructions state they use a grease with moly in it, they actually mentioned the brand Chevron. I do not believe that Chevron has a synthetic grease with moly, so that would mean they were using Delo HD EP moly 3%, Delo HD EP moly 5% or their just their EP moly grease.
So some of the questions still remain; teflon/ptfe vs moly?
-and-
synthetic or petroleum base?
Synthetic SuperLube uses ptfe and shows compatibility with polyurethane.
I also had Synthetic TriFlow grease with Telfon recommended to me by somebody who is into this stuff. That company only say "is compatible with most rubbers and plastics" which probably means polyurethane too.
On a side note I did come across some lengthy compatibility charts such as this
http://www.rubber-group.com/Library/compatability.PDF
A couple things:
Polyurethane acceptable and recommended with:
liquid petroleum gas (lpg), Mobil oil SAE 20, Petroleum oil (crude), Red Line 100 Oil, Silicone Greases, Sunoco All-purpose grease
Polyurethane "minor to moderate effect" with:
lubricating oils (petroleum base), lubricating oils (SAE 10, 20, 30, 40, 50), Mobil Delvac 1100, 1110, 1120, 1130, Natural Gas, Petroleum oil below 250F, Soybean Oil,
Polyurethane "moderate to severe" with:
Propane
Polyurethane "unsatisfactory" with"
Petroleum oil (above 250f)
I am more confused after reading through that, alot seems to contradict if one was trying to see if petroleum or synthetic oils/greases are ok or harmful to polyurethane.
If I thought I was over thinking this then I'd just go down the street to my friendly Chevron distributor and get one of their non-synthetic greases with moly.
If I was thinking that maybe I should use synthetic, or something more specialized with silicone or ptfe, or teflon (or synthetic moly) then I'd be considered SuperLube, Amsoil...others.
Not really sure on anything yet.