Why do you think 180f is too cold for DD if the stock coolant thermostat is set to open at that temp? The engine is designed to get to 180f as quickly as possible and then stay as close to that the best it can.
If you let the engine sit the oil won't get any warmer than the coolant temps, which won't get any warmer than the thermostat temp. Oils are at their rated viscosity at 212f (100c) but the factory obviously feels the oil is close enough at 180f to effectively lubricate. So I think 180f-212f is the safe oil temp zone for a DD. Anything less and I would suggest you change something in your setup.
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