Dennis Yogi from Hawaii has written elsewhere that, in the case of his poly bushings, regular grease cut down on squeeking but synthetic grease eliminated it altogether.
Mike Drew has written as follows:
"...I'm told that conventional grease, which is what you would
be using with a grease fitting, is a very poor choice for this particular job.
Some advocate using white teflon tape, others use some sort of magic goo
that often comes with poly bushings from the vendor, but I have followed Dennis Q
uella's advice and used Permatex silver anti-seize on all my cars. It works
absolutely wonderfully, and doesn't seem to degrade over time."
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