Hoping someone with 6.9 could solve a mystery problem of inconsistent oil pressure by taking note of a couple of items on theirs when they check their oil level, on a car that had been sitting overnight and report back. Do this without starting the car

1) when you removed/unscrewed the cap did you hear that you had broken suction on the resevoir ie there had been a vacuum and (2) what was the oil level reading on the stick. Have a nagging issue with oil pressure and now that I've started...