sqeaky fan on idle
 

Hi Folks, would like to know if anyone has this issue. '02 x5 3.0 upon startup/idle there is a squeaking sound coming from the fan. I know this because I applied a small amount of bicycle chain grease to it and the squeak stopped, but returned the next morning. I hear lubricating it with WD40 or something like that is not good, so I am hoping that someone can shed some light on how to correct this.

Any assistance is greatly appreciated.