While getting back around to the disassembled heater on my bench I thought a little motor refresh was in order. After cleaning out the insides with electrical cleaner and compressed air and slipping it back together I began bench testing and rediscovered the squeal I'd forgot all about. With a little bumping and repositioning it will go away but that won't be an option when it's installed.
So it's clear I need to apply a little grease to the bushings but.... whats the best lube for the job?
Heater motor pics

Give me ambiguity
or give me something else