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OP, I have the same setup: 965 type filter instead of the on-engine cooler, nose-mounted Setrab cooler (no fan), and stock thermostat in the RR fender. I went for a drive today and had no issue with oil temp even though ambient temp was 50F. I think you have a problem with the thermostat, the oil line plumbing or you measurements.
10C (50F) ambient temp
22C (72F) initial oil temp (car stored in garage)
85C (185F) oil temp stabilized after 15 minute drive
90C (194F) oil temp after 2 WOT pulls in 3rd (maximum temp observed)
80C (176F) lowest temperature observed during return trip.
These temps are all from my ECU. The instrument panel gauge approached, but never exceeded the 210F mark.
The engine is an EFI 3.2 short stroke with ITB and dual OOP.
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1978 SC - original owner
1983 SC - D stock "rescue" track car
DECEASED 2015 Cayenne Diesel (rear ended by distracted driver)
2017 Macan (happy wife...)
2016 Cayenne Turbo - tow vehicle and daily drive
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