I installed my blue bushing without any lubrication and I will have to go back and lube it! It makes really loud noise! [:D]
Hasbeen, I am surprised that you haven't use lubrication on polyurethane bushings. Energy Suspension (a very popular supplier of poly bushings in US) includes a specialty grease (it is clear and VERY thick) specifically to be used on ALL of their poly bushings. If you do not use it you are likely to end up with creaky suspension.
As for WD-40... it is NOT A LUBRICANT!!! So do not use to lubricate anything!
Leon
'94 Eagle Talon AWD Turbo 613whp <powered by Mitsu 4G63T
'80 TR7 Spyder GS-T <undergoing Mitsu 4G63T transplant
http://www.cardomain.com/ride/2472999