[Bonanza]

Most ceiling fans today are self lubricating. I would not advise using anything to grease them up because that would probably do more harm than good.

If you don't have the balancing kit from when they were first installed, I would see if Lowe's or Home Depot sells them separately from their fans. My guess is that they are out of balance. Perhaps when you are at one of those stores, their personnel can give you some good information.