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Hello all! Getting right into it with a 2012 yukon slt w/5.3. My oil pressure has ran at 38psi cold and 19psi hot at idle. I had #5 lifter go bad 3 months ago and had all lifters, cam, etc replaced. Motor runs great with 110k miles. Decided to do the plug n play DOD delete to stop the annoying vibration when engaged(aftermarket borla exhaust). My oil pressure now is same at idle but runs at around 21psi when driving and when i take foot off the gas pedal, the psi goes up slightly. Any ideas?

I have a 2017 Silverado 5.3L. Used to stay around 40 pounds of oil. Now when idling, is goes down to 20-25 ish pounds. It’s not throwing any codes up but does have a bit of a knock if I floor it without letting the pressure build back up first. Cold start it’s just below 40 pounds but at operating temps (210) it drops like crazy. It’s not oil quality or level, I just changed it last week and it was good for half a day and went back down.

Hi everyone. It’s my first time here but I need some help. My 2007 Silverado with an LH6 5.3 DOD motor has intermittent oil pressure issues. Alittle back story, the truck has 274k on the original motor. Recently, I replace the valley plate gasket, but only the outer part. For convenience sake, I left the DOD tower gasket part. After that, I replaced the oil pickup tube o ring and gave the truck a full service. My issue now is, I still have intermittent low oil pressure. I’ve read about a service bulletin where the oil pressure relief valve sticks, which requires replacing the oil pump and such but there are so many possibilities I’m not sure what to pursue. I know the oil pressure sensor is good and the screen below it is clean. The issue happens randomly. I can start the truck and it will idle and warm up fine (maybe slightly lower than usual) and then I can drive it. I’ll be sitting at a light or a stop and I can slowly watch the oil pressure fall off. Sometimes even while driving slow and then the oil pressure stays low or 0. It doesn’t cause any bad noises that I know of because I shut it off immediately but I’m so confused. After letting it sit for a bit and starting it up it’s fine. I’ve heard many possibility between it being the oil relief in the pump, the oil relief in the pan that apparently exists, DOD lifter problems (although they aren’t giving me any bad noise) leaking DOD valley gaskets (the ones I skimped on replacing) and more. I’m lost as to what to do. Can anyone offer some insight?

2007 suburban 5.3 AFM delete already done. I had one lifter collapse and did the delete now when cold I have 35 P.S.I. but when hot with 5w30 oil pressure drops to 5 P.S.I. I've replaced rods and mains cam bearing's, put the lingenfelter rivets in the towers, replaced the pump 3 times, changed the cam retainer plate, oil pressure switch, different oil filters multiple times. I turned up the idle when in gear to keep the oil pressure at 10 P.S.I. when idling. now to keep the oil pressure around 35 when cruising I'm running 15W40 I know that is some thick oil for the truck but it's either that or I get a range performance code for oil pressure and yes the oil pressure is correct I have hooked up a manually gauge multiple times. how would I check and see if the towers are leaking internally or if the bar bell is bad it sad for 6 months why I was doing the delete I had to get money together to fix it.