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By opening the thermostat earlier, the full water circuit becomes available sooner at a lower temperature, and peak loads are absorbed more quickly. I’ve noticed a temperature that’s about 10K cooler; the oil is now running at 80°C rather than just under 90°C. Cooler oil = less aging = better protection. The new thermostat only makes a difference under partial load; under prolonged full load, it wouldn’t make any difference, of course.
I should add that I’ve also retrofitted a third radiator, which has helped me maintain very stable oil temperatures. This is essential for the later M96 and generally advisable for the 986, though it may not be absolutely necessary depending on the weather conditions.
I know it's a hotly debated issue, but the figures, data and facts speak for themselves, so I will not reflect any flames ;-)
Btw, Pierburg 7.31081.02.0 is the OEM product. Take care of *not* using aftermarket pumps with metal impeller if you want to do the swap.
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