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You wouldn’t necessarily be able to see a drop in the oil pressure because the oil pressure reading on the gauge isn’t an actual live pressure reading. There is no live oil pressure sensor on these trucks. It’s a ”yes / no” switch basically. If the oil pressure is above the minimum to activate the switch, you don’t get a notice. If the oil pressure goes below the minimum threshold to close the switch, the dummy light on the dash tells you no oil pressure. The psi readings you see on the instrument cluster are the result of an algorithm the pcm calculates based on a number of parameters. It’s an educated guess at best.
Yep. As long as you have 6 psi it reads “normal”.