[rbarton]

Hi again, I was asked to update this thread.

I ended up replacing both the engine-mounted and side thermostat elements. Even though the old ones seemed to test 'OK' using the pot of boiling water method, my engine temperature was reduced after replacing both. It also seemed to drop a little the more I drove the car. Since it had sat for several years previously, I wonder if there was some sludgy buildup in one or both of the oil coolers, or in a passage somewhere. I put a few miles on the car, changed the oil again, and found that I could drive it in mid 90's temps (late last summer) with the oil temperature never rising above 190 or so.

Thanks again for all the help.