As far as the oil cooler, you would be either over cooling the oil, or heating the charge temp higher than you would want. The ideal temps for intake air, and oil aren't close enough to make this a good idea in my opinion. I could possible see running the oil through the radiator similar to the way manufactures handle the transmission cooling duties, but you always have a potential of leaking internally and not knowing about it until its far too late. I think a proper oil cooler set up with a thermostat is still going to be your best bet here.
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