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I constantly monitor my oil temp, in the pan, where it should theoretically be hottest after being spun out of the bearings and drained from the top end. On the street I never see over 180 and on track never see over 250. Not sure about transient oil pressure response, but it sure seems quick on my gauge - I never see under 40 psi and at higher revs never see under 75. If there is a thermostat, it is set too low, as IMO oil needs to get over 200 to properly purge absorbed combustion products , water, acids, etc.
As for water/oil heat exchangers, the concern I have is that eventually, you have to exchange heat to the air and if you limit yourself to the surface area of the radiator, it sure seems that less heat can be dissipated than if you have the extra surface area of the two oil coolers. Also, I have to believe that an oil cooler with 250 degree oil in it has to disspate heat better than a radiator with 200 deg water in it. If I saw real test data to the contrary, I could be persuaded, but I think the factory setup is pretty good.
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