Got a question hoping to pick someone's brain for a min? I have a 2011 Silverado 5.3 4x4 flex fuel 230k on the clock. Back earlier this year, it collapsed a lifter. Local auto parts only had a couple parts to complete the task. So I replaced 2 lifters (all they had) it was number 7 lifter. Replaced all the push rod for that side. Got everything back up and running everything seemed smooth running but my oil pressure was lower than usual. So went back in a few weeks later and replace the pick up tube gasket. Looked better but still not right. Replaced the oil pressure sensor and screen, Replaced all gaskets on everything I dug in to.....I got no oil leaks. I am just assuming I have a weak oil pump at this point. Truck will start up with 40-45 psi. Once it starts warming up it drops as low as 18-22 psi. Oil pump or am I leaning the wrong way?
