IMO, it's duplicate:

- http://superuser.com/questions/707574/what-can-be-used-to-lubricate-a-rattling-fan
- http://superuser.com/questions/366573/can-i-use-oil-from-kitchen-for-oiling-my-fans
- http://superuser.com/questions/370244/what-is-better-oil-for-oiling-fans-grapeseed-or-refined?lq=1
- http://superuser.com/questions/263130/how-to-oil-smps-fan?rq=1