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One consideration could be that the temp sensor is measuring temp at its particular location and is an average. The vicinity of the combustion chambers will be hotter. If localized boiling occurred then heat transfer would be diminished. There could be a negative feedback loop.
I've read on this forum that Box oil temps are well into the 200s - much higher than the ~180F indicated coolant temps, and ofcourse these 2 fluids meet at the oil cooler.
Yeah, H2O has higher heat capacity than EG, so if you were designing a car maybe you could take advantage of this with a smaller volume. But the Box is done and has a proven track record, so why mess with it?
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