I do not completely agree with everyone. I think an oil cooler is a good idea when you turn a stock engine into somthing more, especially a turbo. They generate a lot of heat. It is true that you do not want to have your oil to cool. So add a thermostat. Heat kills and when you feel like tromping on it you have the cooling capacity to do so.

Here is a link of a how to. I like it except for the cooler price (ebay does sell many good ones) and the filter I am using a CM filter. High capacity and fine filtration.
http://www.sportauto.cc/Oil-Cooler/a...ooler_text.htm