NO argument 
Show me. Show me the test case, test scenario. I have 4-5 years of AIM and Motec data logs showing ZERO decrease in water temp. My logs are 25-30min logs and multiple 3-4 hr logs. With and without 3rd radiator, with and without BoxsterS water lines. With and without standard coolant (with/without water wetter)
I *know* you know better than to read the gauge for this. Show me 
We are racing. I have steady state consistent lap times in all sorts of different weather. I'm suspecting what your seeing only pertains to certain circumstances.
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