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Marcin,
I was just searching on "thermostat" and found your question. IMO 9mm is not large enough. The OE thermostat is...one sec while I run to the garage..17mm inside diameter. Also I have learned from this forum that the OE thermostat "protects the cooler from cold pressure spikes" and "shunts oil back to the tank under peak demands". I was also advised to trash the aftermarket thermostat and go with an OE unit.
HTH
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