Oil pressure drop 2007 Tahoe 5.3

[kingbeepa]

confirm lack of oil pressure is real. if so, replace with high volume aftermarket pump. drive till blows up or you get sick or it. whichever comes first haha.


bit confused thou, is the low oil code being set all the time, or only sometimes? have you been driving it around with it saying pull over for lack of pressure.



yours sounds lower than most. but I've seen more than a few threads about low oil pressure. drop the pan to change o ring, new pressure sensors and stuff only to laster go back in for a high volume pump. no clue why it's still low, but the pump hides it and they don't seem to blow up soon after. so eh.

It begins pressure reading around 20 then slowly drops til it alarms.

Yes, I do drive it for a short period before stopping, then it resets the cycle after starting up the engine again.

Already replaced O-ring, pickup tube, oil pan gasket (fixed the leak), oil pressure sensor, and the connector plug for the level sensor… so far.

Also, this all happened after changing the oil and filter. What brand is best to rule out lack of quality in the big picture?

 

[Charlie207]

It begins pressure reading around 20 then slowly drops til it alarms.

Yes, I do drive it for a short period before stopping, then it resets the cycle after starting up the engine again.

Already replaced O-ring, pickup tube, oil pan gasket (fixed the leak), oil pressure sensor, and the connector plug for the level sensor… so far.

Also, this all happened after changing the oil and filter. What brand is best to rule out lack of quality in the big picture?

I think any 5W-30 Dexos 1 and up oil would be fine. As far as filters go, probably any new name brand filter would be fine to test the pressure issue.

I'd still look at the VLOM gasket as another place it could leak. RockAuto: https://www.rockauto.com/en/moreinfo.php?pk=11378161&cc=3305712&pt=10710&jsn=11275

 

[Marky Dissod]

As far as filters go, probably any new name brand filter would be fine to test the pressure issue.

My admittedly blunt rule of thumb for oil filters is as follows:
Never buy any brand name's 'basic' offering.
I.E.:
instead of Fram's PH3675, try XG3675 or TG3675
instead of Purolator L25288, try PBL25288
instead of Wix 51522, try 51522XP
Mobil1 M1-206 doesn't have an upgrade, right?

Also, I prefer ACDelco PF61 over the parts mungqi's 'recommendation'.