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I went from Motorcraft 5W-20 semi-synthetic to 5W-30 Valvoline Advanced full synthetic and have not seen any noticeable difference in the oil temp in normal street driving. Maybe on a race track it would show a difference - or maybe not based on that it's an inferred oil temperature. The Coyote has a coolant to oil cooler at the oil filter mount, so that really helps keep oil temperature constant while just normally driving around on the street.
I can answer this. The answer is, no. I added the Mishimoto oil cooler to my Ecoboost. Absolutely no impact on the oil temp at HPDE events. Now, I'm certain that the actual oil temp has to be at least a little cooler. But the ECU has no way of accounting for the increased thermal capacity, so it just keeps calculating oil temp the same as it always has.
The Mishimoto kit comes with the Mishimoto sandwich plate, with the NPT fitting for the sensor. But as you note, installing a sensor and a real temp gauge will not impact how the ECU reacts. In reality, it will probably only frustrate me more if it confirms my suspicion that the actual oil temp is 30-40 deg cooler than what the ECU thinks. I have read that the GT350 uses an inferred temp as well, but it also has an oil cooler from the factory. So it's calculations are based on the thermal capacity of that system. But if you modified it, it also would not know it. It seems really dumb for Ford to skimp on installing a oil temp sensor in all these cars.
As an FYI, it's not that. All 3 radiators are always 'open' (your GTS has an additional radiator in the middle, as you probably know by now). What happens is Porsche uses an electronically controlled thermostat, not a mechanical unit, like most other cars on the road. In my Cayman GTS, it was more like 30-deg difference (from 220s to 190s); it was ridiculous. That's why I always drove in sport mode. And also due to the perfect throttle mapping for me. But the thermostat defaults to the restrictive mode, meaning if it fails, you'd see the 220+ coolant temperature even in sport/sport+ modes. I didn't like that about the Porsche, to be honest. And that system is prone to failure as miles accumulate.
Thank you for that info. I knew the Bullitts had 'extra cooling', but wasn't sure what exactly that meant. Glad to hear it's 'coolant-to-oil' (rather than air-to-oil), and was suspecting that, since with the new oil temperature gauge, it seemed to get up to operating temperature rather quickly, and that explains it.
Since my 2015 non-PP has the oil cooler, I'd say they all have it. The PP cars get a bigger radiator, which probablt also help cool the oil better in track use.
Doubt it's mapped differently but still probably reads lower due to the fact that water temperature is an input to the calculation and it would be lower after the thermostat is full open.
