This is just a fwiw on the OE oil cooler. It is just a 'pipe grid' w/no fins. I've had my stack apart to clean out the junk that the car sucks up. The air intake at the lower valence benefits greatly from the screen mod listed over at the netreg site in the how to section.
It would seem to me that the oil cooler could use some fins & it struck me that maybe a replacement from the aftermarket could be fitted that would work better under high stress situations. I suppose that under normal street situations the set up is okay, as mine rarely goes beyond 1/2 way unless I'm getting too enthusiastic with my car and at that it never geets to 3/4 on the gauge....usually I cease & desist at that point.
I'm not trying to be a wise guy, but when you mentioned the oil cooler & cleaning I just figured I'd offer up some eyes on info.
Tom