Keep in mind that both synthetic and hydrocarbon oils need to be above 150 F, here in Michigan, on a cold day my oil temp takes almost 20 minutes of driving to even climb past 150 F. On the other hand, if you know you are exceeding 230 F, cooling the oil will also have the benefit of cooling your coolant. The best way to cool the oil is to run a thermostatically controlled oil cooler (not as exotic as it sounds) they are pretty easy to find.