Hello

I have pontiac g8

With 6.0

My oil pressure at idle 20 psi

At 4000 rpm 45 psi to 50 psi

Is that normal ?

The weather 115 FEHERNHAIT

New oil + filter mobile 1 full synithtic

Yes that is normal and safe operating range for a 6.0...my 5.3'* run around 35-40 warn idle and 50-55 running at speed down the road ive seen plenty of 6.0s in the 20-25 range even newer ones with very low miles an engine doesnt need a whole bunch of oil pressure at idle..if it tells you anything..0 lbs at idle was in spec on the pre vortec small blocks