[essentiallysue]

I have experience the sqeekie wheel problem with my mice. After trying everything, including oil, I realized it is the little spots where the wheel two parts join together that make the noise. So I took a drop of safe Elmer's clear glue and put it in each of those 3 connectors. Wheel runs quietly then. Of course, be sure the glue is dry before putting it in the cage. If you wash the wheel a lot, it will eventually have to be done again. My mice run 4 wheels all night and I sleep peacefully.