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Theoretically you are right they dont need lube only replacement after the bushing tears. Mine sway bar bushing made so much noise that I thought the tire was hitting the fender well so I used wax on the inside of the fender well to see where it was hitting the tire. It was leaving out a pretty good groan for me to be that avid about finding.
I would use silicone grease on the sway bar bushings, dont use dyno lube it will deteriorate the rubber. Once lubed with silicone grease it is permanent.
Sway bars do not need to be lubed in the bar to chassis bushing however sometime these bushing can make noise. Lube sold for polyurethane suspension bushings or plain old WD40 applied will eliminate any noise as well as reduce "sticktion" (it's a real word used in suspension design, look it up)
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