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#4604551 - 12/15/17 01:56 PM Delco PF48E low oil pressure
cmlind Offline


Registered: 01/10/05
Posts: 74
Loc: Minnesota
Sorry for the long post.

I have a 2010 Silverado 5.3 with Afm that I drive for work. For a while now the oil pressure has been getting lower. Used to be around 40 psi hot idle and get lower to 30 psi after a few thousand miles on the oil. Been getting lower as the miles go on - at 123k now.

I had the oil pressure sensor start to blip out out a couple years ago, but am starting to wonder if that was due to the filter and not the sensor. I had the sensor and the famous screen changed - a little sludge was on the screen at the time - had used a protech filter and the mechanic was wondering if it had a problem (I doubt it).

In the last few weeks it started going to 15psi at idle and this week it wouldn't break 40 at cold starts (10°) even over 2000 rpm. It had 20% left on the oil and about 7000 miles so I changed the oil. the parts shop gave me a Wix instead of a Delco since they didn't have any on hand and now I have about 38 psi hot idle. Same oil - 5w30 dexos (pronto/WPP). I would only get 25 psi hot idle with the delco when new in August.

Now as I think about this the pressure has been lower with the delco filters. I used to use wix until we got a new mechanic who uses a different supplier and like OEM. I thought I liked oem too, but apparently the delcos restrict more. The filter is the newer ecore with the poppet valve and I haven't cut it open.

Anyone else dealt with this?


Edited by cmlind (12/15/17 02:00 PM)

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#4604586 - 12/15/17 02:36 PM Re: Delco PF48E low oil pressure [Re: cmlind]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
The AC Delco is most likely a Champ build, entry level. I bet if you put an Orange FRAM on there you will see similar results at idle or an erratic oil pressure at idle. If this is a fleet vehicle you may not have any say about what goes on it, in it or shceduled oil changes.


Edited by MParr (12/15/17 02:41 PM)
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#4604594 - 12/15/17 02:47 PM Re: Delco PF48E low oil pressure [Re: cmlind]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17795
Loc: PNW
I don't see how an oil filter could lower the hot oil pressure at idle on an engine with a positive displacement oil pump, and an oil pressure sensor located after the oil filter unless there was something else going on. I'm assuming that's the setup the OPs 2010 Silverado 5.3 has ... or does it have some kind of variable volume oil pump?

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#4604612 - 12/15/17 03:08 PM Re: Delco PF48E low oil pressure [Re: cmlind]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
ZeeOSix
Who knows. It’s a Chevy V8 with 128,000 miles and there may be something else going on. Could be an oil pump going out. With that mileage, the valve stem seals are most likely going bad.
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#4604650 - 12/15/17 03:49 PM Re: Delco PF48E low oil pressure [Re: cmlind]
Ram02 Offline


Registered: 05/13/17
Posts: 131
Loc: New York Queens
Try AC Delco PF64 that might help
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#4604716 - 12/15/17 04:54 PM Re: Delco PF48E low oil pressure [Re: cmlind]
cmlind Offline


Registered: 01/10/05
Posts: 74
Loc: Minnesota
I usually let our mechanic take care of it, but if he is out on jobs and I have nothing to do (construction in MN winter) I do some of my own work. The Wix 57060 seems to be working good now.

"Who knows. It’s a Chevy V8 with 128,000 miles and there may be something else going on. Could be an oil pump going out. With that mileage, the valve stem seals are most likely going bad."

Really - at 123k? I thought these went 200k pretty easy. I have done 5-8k changes usually changing with 30% left for most of its life. Almost all trips are more than 10 miles with a lot of highway trips, some towing and idling also.

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#4604723 - 12/15/17 04:58 PM Re: Delco PF48E low oil pressure [Re: cmlind]
mobilaltima Offline


Registered: 02/03/11
Posts: 1151
Loc: Golden Meadow, LA
Just ask SteveSRT8. he had a 6.0 vortec, if I recall correctly, go 500k miles when he sold it and it was still running great and not leaking or burning any oil. and he changed it according to the OLM. so 123k should be nothing.
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#4604755 - 12/15/17 05:54 PM Re: Delco PF48E low oil pressure [Re: cmlind]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
Yea, really. I worked for our local government for 31 years and it was not uncommon for valve stem seals to be perished. Lifters that wouldn’t pump up on cold start. And an occasional oil pump go out. That was the Chevys. One plus for our shop was the oil was changed every 5,000 miles and NAPA Gold oil and air filters were used exclusively.


Edited by MParr (12/15/17 05:56 PM)
_________________________
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2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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#4604771 - 12/15/17 06:12 PM Re: Delco PF48E low oil pressure [Re: cmlind]
MParr Offline


Registered: 10/28/17
Posts: 514
Loc: Georgia
Maybe you should do a Google search on oil pressure problems in a 5.3 Chevy Vortec.
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2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s

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#4605170 - 12/16/17 09:04 AM Re: Delco PF48E low oil pressure [Re: MParr]
cronk Offline


Registered: 01/06/09
Posts: 1288
Loc: Watertown, New York
Originally Posted By: MParr
Yea, really. I worked for our local government for 31 years and it was not uncommon for valve stem seals to be perished. Lifters that wouldn’t pump up on cold start. And an occasional oil pump go out. That was the Chevys. One plus for our shop was the oil was changed every 5,000 miles and NAPA Gold oil and air filters were used exclusively.


An old school chevy small block like a 350 or 305, maybe.

Chevy switched to the LS style 5.3 in 1999 and I honestly can't remember seeing any that needed valve stem seals replaced. I worked at a dealer for a few years and some of the fleet trucks and vans had 300k or more.
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#4605171 - 12/16/17 09:04 AM Re: Delco PF48E low oil pressure [Re: cmlind]
Triple_Se7en Offline


Registered: 12/04/04
Posts: 8782
Loc: 1/2 hr. north of Detroit
If you are happy with the Wix, stick with it. I abandoned AC Delco for all my GMs several years ago. Also try Fram EGs, soon to contain silicone ADBVs.

As soon as they arrive in stores, that's what I'm switching to. My current batch of Fram Ultras are just too flow-restrictive... to my liking. My engines are pretty clean at 125K and I don't need big-time filtering.

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#4605361 - 12/16/17 12:50 PM Re: Delco PF48E low oil pressure [Re: ZeeOSix]
cmlind Offline


Registered: 01/10/05
Posts: 74
Loc: Minnesota
Originally Posted By: ZeeOSix
I don't see how an oil filter could lower the hot oil pressure at idle on an engine with a positive displacement oil pump, and an oil pressure sensor located after the oil filter unless there was something else going on. I'm assuming that's the setup the OPs 2010 Silverado 5.3 has ... or does it have some kind of variable volume oil pump?

That's what I was thinking with a positive displacement pump - how could the filter cause a problem even if it was in bypass all the time.

I did google this and got mostly information on a screen before the pressure sensor up in the valve train that can plug up. I thought that was the problem, but then found one site where someone was having troubles with the delco filter and they were talking about a tsb on this problem and the solution by GM was to use the gold ultragard type delco filter if that problem happens. Just trying to see if the wealth of knowledge here had any insite.

I do seem to have the problem fixed - keep using Wix!

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#4605386 - 12/16/17 01:11 PM Re: Delco PF48E low oil pressure [Re: cmlind]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
My Chevy LS equipped vans and Isuzu NPRs have been running Fram TG for a long while. I haven't bought a Delco filter in forever.

Also haven't had to do any seals, other than the occasional rear main, but these vehicles are all outside of 250k miles.

One in particular is a real POS with 480k that I wish would have an engine problem so I'd have an excuse to get rid of it.
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17 Maserati GranTurismo Cabrio

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#4605540 - 12/16/17 03:44 PM Re: Delco PF48E low oil pressure [Re: Triple_Se7en]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17795
Loc: PNW
Originally Posted By: Triple_Se7en
As soon as they arrive in stores, that's what I'm switching to. My current batch of Fram Ultras are just too flow-restrictive... to my liking.


What makes you believe they are too restrictive? Motorking provided some flow data awhile back on the Ultra and it looked to flow very well - LINK

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#4605598 - 12/16/17 04:39 PM Re: Delco PF48E low oil pressure [Re: cmlind]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Sheesh. I missed that one too. Ultra too restrictive?

I'm gonna toss the flag on that one. We use the XG5 ( no bypass) on a boat with a modified oil system that has no in-block bypass, with never an issue.

Owner (former circle track racer) swears by that system against our advice, but never comes in for an engine problem.

I've used Ultra on my Cummins (no bypass), and despite our engines having a 50psi bypass valve in block, never an oil pressure issue there, either.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

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