You need to oil fan motors on the axis of the motor spindle. I'm not sure what they are called, but on the back of the motor you'll see a small round piece right in the middle of the motor. This is a bearing where the motor shaft spins. On the inside of that round thing is a felt washer or something similar that holds oil in it, and it's usually got some kind of cap in front of it that holds it in place with holes in it to let the oil seep out. If you can find a small bottle of turbine oil, they usually come with a pull out straw thing that is thin and it extends out 6 or 8 inches from the bottle to help get at places that are hard to oil. The motor will have one of these felt things on both ends of the spindle. If you can get at it, soak the felt washers with the oil, but you need to use the right kind of oil or it won't last long, and using the wrong oil could gum up and really mess it up. You can use any electrical motor oil, or turbine oil which doesn't gum up or get thick when its cold. Accessing the felt washers is much easier if you remove the fan and can remove the motor from the fan, but many times you can get at the bearings without taking the fan apart. Some of the older fans actually have an oil access hole on the motor to apply oil, and it will be marked if it has them. Hope this helps.
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