Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
What is the oil pressure cold and warm? Are you checking at idle?
This is the spec, engine warm 60psi @ 1850rpm.
5w30 or 10w30 oil.
If you have done an oil/filter change, then I would start to suspect a worn oil pump.
In order to replace the oil pump, the front cover must come off. Here are the instructions for both.