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I just did that same experiment!
My SC has been running way too hot. So pulled the engine out and tested the thermostat just like that, only with cooking oil. see my thread "boiling oil". My thermostat never moved , not even a little bit. I found a used one from the forum classifieds, or you can get a new one from Pelican for 175.00.
I did the same test, side by side, with the new one and the one that came out of the car. The new/used one opened at around 180, and the old one never moved. Now I have a cool aluminum paper weight!
It looks to me like you need to replace yours. get a new O-ring too.
S.
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Scot
78 911SC coupe, sold,, 2019 Macan S
"my friends all drive Porsches, I must make amends.."
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