Coolants other than Porsche's

[JFP in PA]

Originally Posted by thstone

As a note to #6, remember that the reason Porsche engineers chose to install a 180 deg themostat was to improve engine emissions and to extend the oil service interval.

I'm not saying that the 160 deg thermostat will cause any problems (it won't); just saying that it was a trade-off.

Nonsense. The OEM stat is there only for emissions reasons, it does absolutely nothing to "extend the oil service interval"; and, in fact, many UOA's have shown that the oil stays in grade longer with the 160 F stat because the oil is simply not seeing the amount of excess heat the OEM stat exposes it to.