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You can decide on lubricant based on application. If it's a high speed situation (motor shaft) use thin oil. If it's a slow moving part (control lever) silicon grease may be the right stuff. If it's exposed to the elements, molybdenum disulfide is good.
I am not aware of the motor mount differences. If there is a need for side motion to correct for tolerances, then perhaps a sloppy grommet is the kind to use. Of course, if the motor moves during operation, we have a source of wow. And if you like the way it works, you will be saying wow.
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