Oil Pressure after oil change

[EastTexan]

What is the "normal" oil pressure supposed to be on a '08 H2 with the 6.2 liter engine running conventional oil? On my '05 Chevy 2500HD with the 6.0 liter gas engine and conventional oil, my oil pressure is always right at 40 psi. On my '08 H2, the oil pressure varies between 20 psi and maybe 35 psi, but never hits 40 psi.