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I would imagine that the oil pressure would be higher than the coolant pressure.
There is probably an internal leak in the heat exchanger which, when hot, allows the oil to impregnate the coolant. But as the engine stops & cools, there is still pressure in the cooling system (but not in the lubrication system) which forces a small amount of coolant into the oil. This coolant would then evaporate when the oil is again up to temperature.
At least that's my theory.....
I would be interesting to know if Porsches "never needs replacement" coolant has anything to do with these failures.
Looks like Brad & JFP's diagnosis were correct - again!!
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