On the pentastar in my 2017 Ram 1500, the digital indication for engine oil pressure ramps up to 99psig on cold start (as high as it indicates). It does level out to ~35psig at hot idle.
Originally Posted by MotoGuzzi
Regarding the oil pressure, the oil pump has a low and high side. The pump operates on the high side until the oil reaches about 150 F and when the engine is above 3000 rpm. After the oil reaches 150 F, idle pressure will be about 25 psi and above idle will run about 40 psi. These observations are based on my experience with a '13,'14 and '18 3.6. Good engines, zero oil consumption and good fuel economy. I change oil myself at 5 k using synthetic. Maybe overkill but it gives me an opportunity to give the vehicle a good going over and buying PP and a Mopar filter at Walmart it costs only $30. Note, the 11-13 3.6 uses a different filter than 14-18.