I have a 3 year old Dell laptop with me, the fan bearing for the heatsink needs lube badly. Unfortunately, the fan itself doesn't seem to have a rubber cap, just a round piece of metal that looks impossible to remove. Anyone have any ideas? I wonder if it's designed to pour lubricant directly into it but that sounds unlikely. I've included an image.
take the fan out and flood it wherever you can with RP7 or WD40 or something to use in cars then spin the fan a bit and move the blades up and down then empty the excess and make sure nothing else drips out before re-installing it
also you may want to look on ebay for a replacement if this does not work..