CARNZ did a DIY to install a Forester XT oil cooler (coolant-to-oil, not air-to-oil)
here. I asked him about the idea of using the coolant lines from the throttle body (seen
here) instead of running them from the block, and he didn't see a problem with it. I know some turbo kits use those lines, so there may be conflict if you have a turbo.