I have actually the opposite problem regarding oil temps. In winter my M-10/C-90 is lucky to get up to 140 degrees, summer, 70 at 3000 feet, 180 degrees. I checked the temp gauge and it was accurate. We generally concluded it was due to the large amount of airflow through the engine/baffling. The low temp is a problem as moisture is never effectively driven out of the oil. So far I haven't done anything about it, but I am considering a "winter baffle mod".
Regards, Dave N9518V
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