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Originally Posted by EndyKwon
So running an oil cooler would make the engine run less efficiently as far as MPG goes?
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Heat energy flows from hot to cold and based on the difference in temperature from one side to the other (delta T) and the material properties, it will determine how fast energy is transmitted through the material.
That being said, the heat energy is generated by fuel energy. You want to have more of that energy end up turning your crankshaft as opposed to going into the atmosphere as heat. Running hotter reduces the delta T in the combustion chamber allowing more of the heat to stay in as opposed to going into the coolant. (this is super basic overview).
as a rule of thumb your fuel energy is 30% crankshaft power, 30% cooling losses, 30% exhaust, and 10% friction.
What they are attempting to do with running hotter is take some of the cooling % and put it back into crankshaft power. We are talking very small amounts... but every bit helps to meet the future regulations.