Oil Pressure

I just changed my oil in my 2004 Silverado for the first time, to Mobil1 5w-30. I have noticed that the oil pressure now seems to stay around 40-60 psi and jump up to around 70 when accelerating hard is this normal?

yeah..Thats normal.

Which engine do you have? I have the 8.1 and recently changed my oil for the first time and put in 10W-30 Valvoline. My pressure runs at around 45 at crusing speed and drops to around 25 at idle. I don't know if this is normal or not.

I have a 99 5.3 w 90K and i use Valvoline 5w30 and my pressure is about 40 -50 idling, and 60-65 cruising

Here are the specs straight from GM
Lubrication System

Oil Capacity - Without Filter
5.7L
6.0 Qts

Oil Pressure - Minimum
34 kPa @ 1,000 RPM
5 psi @ 1,000 RPM

Oil Pressure - Minimum
69 kPa @ 2,000 RPM
10 psi @ 2,000 RPM