You may well have voided the warranty already by oiling the fan, jerhi, if the fact that you have done so is evident. Using the wrong oil or using too much of it is likely to cause far more harm than good.
I very much doubt that you will find a third party fan that actually fits, unless you hack the existing fan enclosure to install a replacement. This will certainly void any warranty you may have had. Notebook computer manufacturers generally don't take kindly to people messing with the cooling systems of their computers!
Generally fan noise in Macs isn't due to bearing lubrication issues anyway, but simply to dirt build up on the fan blades. If a bearing issue has occurred within the first few months then you would be crazy not to simply have it replaced with the correct original part under warranty.
Replacing the fan in this computer is very straightforward . If you ring an AASP or Apple Store genius bar beforehand to make an appointment, or take the computer in to demonstrate the problem they will probably be able to order the part in (if they don't already have it in stock) and replace it on the spot. It is unlikely to result in any lengthy wait.
If you are determined to do the job yourself then you can see
http://www.ifixit.com/Guide/Repair/Installing-MacBook-Pro-13-Inch-Unibody-Fan/13 38/1 for a link to buying the relevant replacement part.
Rod