It has been a bit hot here in Florida. Although I installed a lower temp thermostat it makes no difference in normal operating temperature when ambient temperature is high. I have read all the purported benefits of a low temperature thermostat. Having worked on cars for almost 50yrs. I do have some perspective on how cooling systems work. I am sure Porsche engineering designs consider an optimal operating temperature but not sure what that temperture is. Understanding cooler may be of some benefit I could not find on the forum a sound reasoning that low temperature thermostats are the solution. Once the thermostat is open it is actually the fans, radiators, rate of coolant flow, airflow and ambient temperature that affect operating temperature. If one wished to have an engine running cooler it would make more sense to me to install lower temperature fan thermostats.