If you've already got a lot of oil on your face, a face polish can be your best friend.
I have a naturally oily face, and started using a face polish as a one off because I saw one on sale one day.
It was seriously the best thing I ever did for my face -- getting all that junk out of my pores for the first time felt great, and since the face polish takes away some of the oil, the pores actually became smaller the more I used it, since they weren't filling up so badly.
Of course, you can's use polish all the time. Remember, no matter what polish you use, faces are delicate, even if they're oily. Your face skin has a pH balance, and its important not to throw it off.
So follow the instructions, use it once a week or less, and you'll get awesome skin results too.