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Bob: The information, you gave us from Lycoming, is of  course absolutely
right. The conclusion you derived from that information is absolutely wrong.
The problem is that if the oil does not reach 180deg F the valve does not
close to force the oil through the cooler, but the oil can still go through
the cooler. On most engines enough oil enough oil will go through the
cooler, so that the oil will never reach operating temp, if the ambient
temperature is below about -5degC.
Now an engine with a worn thermostatic valve might cause overheating (there
are service bulletins about that), but never overcooling. The pressure
relieve valve only opens, to bypass the oil cooler, when the oil is very
thick, so that the seams of the oil cooler won't blow. The oil cooler isn't
as strong as the lines or oil galleries in the case. I guess that if the
oil, in the cooler, were so thick that it wouldn't flow you wouldn't have
the overcooling problem.
Bill N7WB

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