My office fan went from squeaking a little when I first turned it on, but then the quieting down once it warmed up, to full on constant high pitched whine that didn’t stop.

Last year I had ineffectually sprayed some white lithium grease in between the slots. It maybe helped delay the problem a little, but this time I decided to take it apart and see if I could actually get the grease in where it needed to go.

Turns out there’s a nice little nipple/reservoir at the top for this very purpose. The white lithium grease straw fit perfectly in the little hole at the top.

A few sprays later and a little cleanup made my cheap fan I bought back in 2010 whisper quiet once more.