I concur, never attempt to lubricate one of those small computer fans,
ESPECIALLY ONE INSIDE YOUR POWER SUPPLY! This could be an indicator that
the fan in the power supply is about to give it up. If that is the case
replace the power supply before the fan does die and the power supply
tanks
and takes other more important and heat sensitive components with it.

Unless you've previously replaced the power supply, chances are that
putting
in a $5 fan will double its value. (like putting gas in a yugo)

"but they drive with pride......"