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Tool Talk Discussion Forum

low oil pressure

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woodbutcher

01-13-2021 07:34:56




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I bought my 2013 GMC Sierra 1/2 Ton, 2WD with 5.3 engine new in 2013, and the oil pressure gauge showed low readings from day one. When it was cold it would show less than 40 psi, and after warm-up it was down around 30. I have 35K miles on it now, and oil pressure readings are probably 30 psi at best. The factory gauge doesn't show numbers, so I'm guessing. I'm hoping the O-ring on the pickup tube is the problem. Replacing it would be easier than replacing the pump, but I'll probably hire it done. Does anybody have experience in comparing the cost of this job to doing the oil pump replacement at the same time?

Butch

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DoubleO7

01-15-2021 14:02:07




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
If you have only been looking at the dash oil pressure gauge that has no numbers, how is it you came up with the numbers you posted??

You might be worrying about nothing.

A real mechanical gauge might even show higher pressure than recommended.



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woodbutcher

01-16-2021 02:42:03




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 Re: low oil pressure in reply to DoubleO7, 01-15-2021 14:02:07  
The stock gauge has a 40 centered on it with lines that divide the rest of the face into equal spaces. It's just a guess as to what the actual reading would be. Yes, a mechanical gauge would be more accurate.

Butch



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Carlmac 369

01-15-2021 06:40:39




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Quoting Removed, click Modern View to see

Doesn't look like it will.

https://www.wixfilters.com/Lookup/PartApplications.aspx?Part=57045XP



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Hdonly

01-15-2021 06:16:32




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
GMC trucks have lockwashers. Chevrolet trucks don't.



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Carlmac 369

01-15-2021 05:11:18




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Quoting Removed, click Modern View to see

A GMC is exactly like a Chevrolet. Trim and badges excepted.



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woodbutcher

01-15-2021 06:04:10




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 Re: low oil pressure in reply to Carlmac 369, 01-15-2021 05:11:18  
My BIL says the same thing, but he says they tighten all the bolts on the GMC's.



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Hockeygoon

01-14-2021 19:50:52




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
GM gauges are notorious for poor readouts for the past 15 years - rebuilding the entire gauge panel on everything from Impalas to pickups has become quite the cottage industry.



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Sprint 6

01-14-2021 17:02:09




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Use a WIX 7045 and your pressure will increase. The oil pickup o'ring is an old wives tale with the 5.3. They did have some issues pinching that ring on assembly in 1999, never seen it since. I've been around the LS engine since the beginning, worked at a GM dealer then.



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woodbutcher

01-15-2021 06:08:20




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 Re: low oil pressure in reply to Sprint 6, 01-14-2021 17:02:09  
The number has me confused, Sprint. I ordered two Wix 57045XP from Amazon, and I hope I didn't make a mistake. All the Wix charts call for Wix 57060 on this pickup. Will the 57045 work?

Butch



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Jeff nwoh

01-15-2021 10:21:27




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 Re: low oil pressure in reply to woodbutcher, 01-15-2021 06:08:20  


57045 is a longer oil filter than original. It will fit fine, and presumably will have more filter media in it. I use them on my 5.3 and 6.0.



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woodbutcher

01-15-2021 03:23:02




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 Re: low oil pressure in reply to Sprint 6, 01-14-2021 17:02:09  
Thanks, I'll order one of those filters.

Butch



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dr sportster

01-14-2021 12:41:23




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
If the GMC is anything like a Chevrolet that is normal Nothing is wrong.



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John M

01-14-2021 11:44:34




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Dont worry about it, its normal.



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KF

01-14-2021 05:10:03




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Those engines have variable valve timing that uses a oil pressure operated solenoid. When the system has problems the oil pressure can drop and excessive oil can spray up on the cylinder walls and cause oil consmuption bacause they use a high volume oil pump.



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Ultradog MN

01-14-2021 02:30:04




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
I don't know if they are the same but my 2013 6.0 only reads about 40 psi cold. At highway speeds it drops a couple and drops a couple more at hot idle.
Had two 6.0s before this one and they read about the same. Both went to 200K before I traded.
Here's an idea I had and have wondered about:
Could GM have reduced oil pressure as a means of increasing mileage? It takes more energy to produce and hold 50 psi than it does 40 psi. In these times of extreme efforts to maximize mileage maybe?

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Jeff nwoh

01-13-2021 20:46:01




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
What oil filter are you running? Certain brands tend to lower the oil pressure. Try a wix or napa filter. I've had 2 different trucks do it with 2 different brand filters. Ac delco was one of them, but I've also run delco successfully. Luck of the draw i think.

Those 5.3 engines also have a second pressure relief to lower the oil pressure to the valve train for the active fuel management, so the probably never show real high to start.

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woodbutcher

01-15-2021 03:25:24




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 Re: low oil pressure in reply to Jeff nwoh, 01-13-2021 20:46:01  
AC-Delco



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Goose

01-13-2021 16:38:30




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
I have a 2000 with the 5.3 engine, 216,000 miles on the clock. It holds 60 lbs oil pressure on the road--when the oil is fresh.

When the oil has several thousand miles on it, the pressure drops to 40 on the road. It's always been that way.



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woodbutcher

01-15-2021 03:27:23




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 Re: low oil pressure in reply to Goose, 01-13-2021 16:38:30  
I am getting close to time for an oil change. That may be part of the problem.



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Mike(NEOhio)

01-13-2021 16:12:26




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Comments about the sending units reminded me. Remember when graphite oils came out around 1980? I started using it in my Scout and 76 Plymouth 360. After a few months the oil pressure on the Scout was gradually dropping. The Plymouth oil light came on earlier and earlier when slowing down till it stayed on at 35. I put a mechanical gauge in place of the sender and it was 40 at idle. Stopped using the s**t and they both eventually came back to normal. That stuff didn't stay on the market long.

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Red Dave

01-13-2021 13:01:31




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
I have a 2010 Sierra 1500 with the same engine. About 80,000 miles or so on it.

I just got home from about an hour's drive and the oil pressure drops just below 40 at an idle and gets to between 40-50 while driving. Synthetic oil. That hasn't changed in the 10 years I've owned the truck.

Those engines will use some oil on highway drives when the computer shuts down cylinders. I forget the details why, but there is a fix you can do. You can google it, there are a lot of sites that can tell you about it. I usually just add a quart between changes, that's cheaper than the fix.

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woodbutcher

01-15-2021 03:32:57




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 Re: low oil pressure in reply to Red Dave, 01-13-2021 13:01:31  
Oh, yeah. I forgot about that feature. I'm using synthetic oil, too. Thanks.

Butch



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buickanddeere

01-13-2021 11:19:59




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Crank driven oil pump on my 6.0 failed on startup .replaced the plump with a high volume unit from Chev racing division . Holds 30psi at idle 284$ over 200,000 on the engine .



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woodbutcher

01-13-2021 12:26:48




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 Re: low oil pressure in reply to buickanddeere, 01-13-2021 11:19:59  
I've read about those. Sounds like the way to go.



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DERM

01-13-2021 11:10:55




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Did you check the pressure with a mechanical gauge? In nearly 50 years as an auto tech I replaced a lot of sending units. By the way an mechanic gets paid for his labor but a tech gets paid for his knowledge! LOL We all start as mechanics !



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woodbutcher

01-13-2021 12:28:58




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 Re: low oil pressure in reply to DERM, 01-13-2021 11:10:55  
No, not yet.



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Mark-IA

01-13-2021 10:28:22




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
remove the oil sender unit and see if the screen is plugged.
Chevy Engine Oil Pressure Sensor


The Chevy engine oil pressure sensor problem has been going on for a long time. With that said, the vehicles with the most pressure switch problems fall in the range of V-8 engines from 2003 through 2012. At some point in the model year of 2007, Chevrolet realized an issue existed.

They decided to place a filter screen around the Chevrolet engine oil pressure sensor. They did this because they believed sludge and debris found its way into the sensor. Not only did this not fix the problem, it created another. Now sometimes when you pull the protective filter screen out, you find it completely clogged.

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Pete in Holland MI

01-13-2021 09:23:08




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Same truck, year and engine here. 38 psi at highway speed, warmed up in the summer when new. 122,000 miles on it now, has dropped to 36 psi. Also use Mobil 1.

I wouldn't worry about it.



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miangus

01-14-2021 08:32:57




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 Re: low oil pressure in reply to Pete in Holland MI, 01-13-2021 09:23:08  
Correct answer.



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woodbutcher

01-13-2021 12:31:42




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 Re: low oil pressure in reply to Pete in Holland MI, 01-13-2021 09:23:08  
I'm using full synthetic Castrol. The oil pressure never concerned me too much, but it is lower now than it used to be.



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David G

01-13-2021 09:22:03




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
They have lowered oil pressure to reduce the parasitic load.

I would assume it is fine.



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jniolon

01-13-2021 08:38:23




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
old adage I've always heard is you only need 10psi for every 1000 rpms the engines turn.

I had to put a new 5.7 in my 2008 suburban and brand new it only ran 30 psi at idle and about 40-45 at high speed... mechanics tell me that's plenty.. BTW I use Mobil 1 and change at 5k

john



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woodbutcher

01-13-2021 12:33:36




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 Re: low oil pressure in reply to jniolon, 01-13-2021 08:38:23  
I've never seen this gauge show more than 40 psi.



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gab

01-13-2021 08:28:09




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
My 2013 is about the same, I'm thinking it's normal.



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JF in MI

01-13-2021 08:28:01




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
I ordered my Ford Club Wagon new in 1990. Always changed oil every 3k miles. After about 150k miles I noticed the pressure getting slightly lower as the years passed. I knew (from decades in the business) that Ford bearings were "softer" (some may argue this) and resigned myself that even though I kept up on oil changes the engine just plain wore down. Before pulling the bottom end off the engine I decided WTF, I'll try a new oil pressure sender first. Pressure went back to like when it was new. May be worth a try.

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woodbutcher

01-13-2021 12:34:55




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 Re: low oil pressure in reply to JF in MI, 01-13-2021 08:28:01  
Good to know. Thanks.



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Steve@Advance

01-13-2021 08:08:35




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 Re: low oil pressure in reply to woodbutcher, 01-13-2021 07:34:56  
Those don't run very high oil pressure.

That's about what mine runs, same same truck, same engine.

I've never looked up the specs, but everyone told me not to worry, that's normal.



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woodbutcher

01-13-2021 12:36:35




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 Re: low oil pressure in reply to Steve@Advance, 01-13-2021 08:08:35  
Thanks, Steve and Billy.

Butch



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Billy Shafer

01-13-2021 11:14:23




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 Re: low oil pressure in reply to Steve@Advance, 01-13-2021 08:08:35  
Most of the Onan engines. Start at 40-45 pounds. When hot drop to 30-38 pounds. I would guess that would be a normal range on that engine.



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