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oil pressure drop

Jworks
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Jworks Enthusiast

Jworks

Posted
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Posted
13 minutes ago, newdude said:

 

 

Filter.  We see them at work, they seem like they start to bypass early or are having an internal issue, and its worse on the longer oil drain intervals. 

 

Switch to the UPF-48R or PF-63 and you will greatly reduce and possibly never see an oil pressure issue down the road.    

newdude, it sounds like you work for a dealership.  I just looked up the UPF-48R.  I'll do that with the next oil change.   Thanks much.

Bleepster Enthusiast

Bleepster

Posted
Posted (edited)

just to show how my truck behaves  here are 4 pics from my commute home from work.  its only a 15 mile commute at 60mph for 10 of the miles

Pic 1 first pic i am at operating temp - 60 mph - 1500 rpms  oil pressure 42psi

pic 2 - further down the road - oil at 40 psi

pic 3  - in city - 40 mph and oil at 38psi

pic 4 in town at stop light - 22 psi

 

370575642_oil1.thumb.jpg.88ab18a9903c23dc11045bb3abd185ff.jpg255615222_oil2.thumb.jpg.72db16c954985e85cf4fd43f2fce8921.jpg485232494_oil3.thumb.jpg.e7f1fc9e1e98cfe23e3c55b8e6c07473.jpg1723523595_oil4.thumb.jpg.f6d8ff49f962f9457669b398f63031cb.jpg

 

 

Edited by Bleepster
reorder pics
  • 3 weeks later...
Jworks Enthusiast

Jworks

Posted
  • Author
Posted

Bleepster, good visual pics of just what I was referring to.  My mechanic told me not to worry, even the 22psi was well above GM's specs.  So I'm not worrying.  I'm still seeing 30 and sometimes 22 at idle, 40 hwy.  Thank you for your responses.

Jworks Enthusiast

Jworks

Posted
  • Author
Posted
On 6/13/2022 at 1:01 PM, newdude said:

 

 

Filter.  We see them at work, they seem like they start to bypass early or are having an internal issue, and its worse on the longer oil drain intervals. 

 

Switch to the UPF-48R or PF-63 and you will greatly reduce and possibly never see an oil pressure issue down the road.    

Newdude, I have an oil change coming up.  When this issue started I changed oil & filter , this time doing it myself -- using Mobil 1 instead of the Dexos the dealer has been using.  Do you think the Dexos oil is good?  I'm thinking what you said about the oil filters and what you said "we see it all the time" and recommending the UPF-48R or PF-63 would prevent this problem.  So, my question to you is your opinion on the Dexos oil before I do the next change.  I will follow your recommendation and go with the UPF-48R or PF-63.

BlancoSilverado Enthusiast

BlancoSilverado

Posted
Posted

Does this engine have the tiny filter before/at the oil pressure sensor? that tiny filter might be causing an issue with what the sensor can see. If it doesnt i would trust @newdude for this(without seeing the truck).

newdude Senior Enthusiast

newdude

Posted
Posted
18 hours ago, BlancoSilverado said:

Does this engine have the tiny filter before/at the oil pressure sensor? that tiny filter might be causing an issue with what the sensor can see. If it doesnt i would trust @newdude for this(without seeing the truck).

 

 

That is a possibility too since OP has a 5.3.  If that is plugged up, can cause bad readings.  

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
19 hours ago, Jworks said:

Newdude, I have an oil change coming up.  When this issue started I changed oil & filter , this time doing it myself -- using Mobil 1 instead of the Dexos the dealer has been using.  Do you think the Dexos oil is good?  I'm thinking what you said about the oil filters and what you said "we see it all the time" and recommending the UPF-48R or PF-63 would prevent this problem.  So, my question to you is your opinion on the Dexos oil before I do the next change.  I will follow your recommendation and go with the UPF-48R or PF-63.

 

 

Oil isn't the issue, filters and as BlancoSilverado brought up and I totally forgot about, the oil pressure sensor has a filter screen underneath it that can get all gummed up and cause issues. 

 

Nothing wrong with the bulk AC Delco Dexos oil the dealer uses, but you can buy much better oils on the market.  Shell Rotella Gas Truck, Amsoil, Pennzoil Platinum to name a few.  Some of those even outperform Mobil 1, but Mobil 1 is still a good option.   

 

On the oil filters, we also have a used car dealer who buys only AC Delco PF48E (the regular ones) from us because the aftermarket filters he was buying, he'd change the oil on trucks he'd buy for the lot, go and test drive them and within 5-10 miles they had oil pressure warnings come up on the dash.  He started using the AC Delco, no issues that he has reported.  

 

The PF-63.  It has a higher bypass pressure of 22psi instead of 15psi in the PF-48 family.  I "think" that it seems to help keep a stronger ability of allowing it to bypass quickly, but I'm not an oil filter specialist lol.  

 

Edited by newdude
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stu_pidasso Enthusiast

stu_pidasso

Posted
Posted

I've had numerous GM trucks across three different generations, both personal and company. They all seem to do this, averagely hover around 40, move between 20-60. I wouldn't worry about it personally. If the gauge pins out or barely reads, then I'd be interested in finding out why. But if it is steady and occasionally bounces around and still is a healthy pressure, then its no cause for alarm. 

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