You can try pulling the motor, but most of the time any noise from those motors means replacement. I have tried lubing them andd it is a very temporary solution. Pull the motor out and do a search for the model number for a replacement.
Have you tried cleaning the fan blades? Over time, they can build up a coating of grime that causes an unbalanced condition and they vibrate. Doesn’t always work, but it is a pretty simple and cheap fix when. It does.
As for a lubricant, I prefer Boeshield T-9 over all others for this kind of situation.