Just have a question about the oil pressure in my truck. Watching it yesterday, air temp: 48*, engine temp: 181*, engine rpm: ~2,000, speed: 70mphs, engine oil: 5w40 Shell, oil pressure 65-70. Seems like it always does that. I only have a 20 min drive to work, so it never gets super warm for long. When I let off or at idle it is 25-30. touch the throttle, it goes up . Do these numbers sound normal? I do know that it runs lower if I am running it longer. Just trying to understand that guage better. Thank you for any input!