by 
The Curious Bag
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<h4 class="dechead">On One Hand: Signs of Trouble
If your ceiling fan is making a grinding noise or a ticking noise constantly, this is a sign that your fan needs to be oiled. Generally, fans that are quite large or have a visible motor are designed to need frequent oiling. Even models that are completely sealed can run dry over time and may require an oiling to return to normal function.
On the Other: Safety Considerations
Oiling a ceiling fan, particularly one with a closed housing, can be dangerous. Turn off the power to the fan before attempting to oil it. It is safer to take the fan down from the ceiling first, oil it and then replace it.
Bottom Line
Ceiling fans that are run on a consistent basis will eventually need to be oiled. If you do not feel comfortable doing this yourself, it is best to call a lighting expert to do the job for you.
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