I think lube oil should be about 160 to 180 degrees.
You say "the engine runs in the cool range" .. Does that mean cool ... coolant? Probably. The oil temp is more or less independant of the coolant. The coolant is artificially controled (temp wise) by the thermostat. Change thermostat .. Change coolant temp. But lube oil temp is comparatively telling you the actual temp of the engine as there is nothing but a small oil cooler that uses coolant to stabilize the oil temp. So I'm guessing you're oil temp is actually about 165 degrees. I would'nt want mine much cooler and would'nt mind if it were a bit higher. Sounds good to me. But I'm no engineer.
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Eric
North Western Washington State USA
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