excellent card you have there, it uses the seperate agp bridge chip heatsink which means you can change your stock cooler to a different one if need be.
now as someone posted above recommending the accelero s1 cooler to you i dont think it would fit since the bridge chip heatsink would be getting in the way of the heatpipes.
to re-oil your fan all you need to do is remove the heatsink which the fan is mounted in. it has 2 push plugs, the white ones, so you need to pinch the ends on the backside of the card and push them through to release the heatsink off the card. use pliers if you need to but i can usually get it done with my fingers.
when the heatsink comes off remember that you will need some thermal paste to replace the stock stuff wich is probably a thermal pad.
on the underside of the heatsink there will be some tiny screws, usually 3 screws, unscrew them and the fan will come off. (make sure you have unplugged the fan from its connector on the card).
now on the backside of the fan there will be a sticker, under that sticker is usually a sort of bung, can be easily removed using a small tiny screwdriver or a pin.
remove the bung stick some oil down there, rotate the fan, push fan up and down so oil goes all around the bearings and then put bung back on. the sticker which was originally there is probably lost its stickyness so clean the fan to make sure its dry and use some selotape or insulation tape to cover the bung.
stick fan back on to card and put it all together and it shoudl be running fine.
may need to do this every year since the oil tends to dry out on these fans,
sorry if this sounds rushed but i got to chip out for a while,. i will be back later on today and will check this thread so post more if you come across any issues.