junkeymonkey :
''Never use WD-40 for anything besides trying to free rusted parts and cleaning.''
really?? where did you learn this from ??
''
WD-40 is not a lubricant.
EDIT: It can, in some small circumstances, be used as a very light lube. However.......
1. There are better actual lubes.
2. It may wash out whatever actual lube was in the fan in the first place.
And since we don't really know what the OP is actually doing, this is all speculation.