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THE WAY IT WAS DONE...
...before the advent of permanent ANTI-FREEZE, the cooling system was (supposed to be) serviced twice annually.
In the fall, the system was flushed and a 180 degree thermostat was installed, along with an alcohol based coolant. In the spring, another flush and a 160 degree thermostat install with water and a lubricant/conditioner.
When permanent anti-freeze came along it was kept all year long with a flush every two years.
Also, modern oils usually need to see 180 degrees minimum to lubricate/clean correctly and the temp is necessary to allow water vapor to be vented out of the crankcase, especially if a road-draft system.
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- WHY IS IT ... 
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... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag?
WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)