I have 07 suburban with the 5.3l. it has 184k. well maintained. last month the wife said the engine is making a noise. i test drove it and i can hear the Power steering pump is starting to go.
Few days ago, i took it to the store, and noticed while decel, and turning left or right the oil pressure gauge would drop from 60 to about 35psi, and when i come out of the turn and give it throttle, the
oil pressure would jump back to 60psi.
i have scanned for DTC no active or permanent.
any idea?
thank you

 

Welcome from Florida. Did you check the oil level? The oil pan may have to be removed and cleaned along with the pickup screen on the oil pump.

 

Those are still pretty good pressures for a 184k motor.