First off, I can't believe I never decided to search for a forum like this, I love smart people! lol. Anyways I am working on a Liquid cooling project for a highly overclocked computer system. Originally I wasn't going to use a heat exchanger(Matter of fact, until I stumbled across one on a website, I didn't even know they made them for PC applications). So I made a crude diagram to better explain. I am planning on running one side with mineral oil or synthetic motor oil and the other with water/PC coolant. My question is would I use to oils in the initial heat area (south) or in the secondary (north) side? My first plan was to use Isopropyl Alcohol and water/coolant, but with evaporation and not wanting to seal the system I scrapped that idea. Also would I want the heat exchanger before or after the radiator? Where would it be most effective at removing heat? Any thoughts or comments would be much appreciated thank you.