hey guys new to the forum and need some help. the suburban is an 2009 ltz 1500 model 5.3 flex fuel. I have low oil pressure at idle with engine warm its anywhere between 10 and 20 psi . I put a mechanical gauge and that's what I am getting. now I have already replaced the oil pressure sensor,i have taken out the screen underneath it cleaned it and put it back and still no change. The oil level is perfect I am starting to think its my oil pump or a clogged oil pick up but don't wanna change those parts with out being sure. any suggestions are greatly appreciated. I even herd some where that the oil filter could be wrong and I should go with the oem filter

 

I've heard that the wrong filter can cause this on other engines, not sure about the GM one.

a new filter may be your cheapest fix. Worth a shot before you tear into something harder.