For me, all I had at the time was Bicycle Chain lubricant. (One of the good brands)
One drop on the rotor and operation was smooth once again, worked great for every fan I tried it on, even worked great on my folding knife, flicks really smooth now as well.
Just earlier this evening I finally got mad at my PSUs 140mm fan being loud, the bearings were dry. I used olive oil to lube the fan and it worked great, silent bearings now. Not sure about the longevity of it when used in a fan, but it was all I had in my room at the time
I've only ever had to oil one fan (120mm). I used a drop of mineral oil from the capsule that came with hair clippers. A second drop of oil improved it further, and a third was even better. Four drops of oil was the same as three drops so I stopped at four.
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