[DennisAN]

In most cars a "low temp" thermostat is a bad idea. But in the water cooled Porsche engine, the thermostat is put in an oddball location. Most cars put the thermostat in the EXIT port where the hot coolant leaves the engine going off to the radiators. In the Porsche engine, the thermostat is put in the INTAKE port where the (cooled off) coolant returns from the radiators and enters the engine. Perhaps this is why the low temp thermostat is helpful.

I've never figured out why the Germans put the thermostat in that location. IIRC my VW Scirocco and Jetta did the same thing Porsche did. The Americans, British, and Japanese all put the thermostat in the output port, so that hot water goes off to the radiator.