Mine always ran at around 95C with the original (buff) PRT, which showed a nice response to pump pressure (i.e. engine revs). With an experimental swap to the then specified black version, normal running was brought down to 87-90 degrees, but with much less revs sensitivity. I suppose there will be differences depending on thermostat type. I believe the earliest 1.8Ts may have had the conventional stat, which became the PRT sometime after 2003, though I'm probably wrong on that. Anyway, the current selection of aftermarket PRTs is a quagmire. They're no longer specified with both temperature and relief spring pressure variations and can only be regarded as conventional inline thermostats. The latest meaningful recommendation from Xpart was several years ago and was for the grey version. Now, I doubt anyone knows what's right.
TC
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