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low oil pressure

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woodbutcher
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PostPosted: Wed Jan 13, 2021 12:34 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

Good to know. Thanks.
 
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woodbutcher
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PostPosted: Wed Jan 13, 2021 12:36 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

Thanks, Steve and Billy.

Butch
 
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Red Dave
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PostPosted: Wed Jan 13, 2021 1:01 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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Mike(NEOhio)
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PostPosted: Wed Jan 13, 2021 4:12 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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Goose
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PostPosted: Wed Jan 13, 2021 4:38 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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Jeff NWOH
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PostPosted: Wed Jan 13, 2021 8:46 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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Ultradog MN
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PostPosted: Thu Jan 14, 2021 2:30 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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KF
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PostPosted: Thu Jan 14, 2021 5:10 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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miangus
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PostPosted: Thu Jan 14, 2021 8:32 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

Correct answer.
 
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John M
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PostPosted: Thu Jan 14, 2021 11:44 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

Dont worry about it, its normal.
 
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dr sportster
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PostPosted: Thu Jan 14, 2021 12:41 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

If the GMC is anything like a Chevrolet that is normal Nothing is wrong.
 
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Sprint 6
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PostPosted: Thu Jan 14, 2021 5:02 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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Hockeygoon
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PostPosted: Thu Jan 14, 2021 7:50 pm    Post subject: Re: low oil pressure Reply to specific post Reply with quote

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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woodbutcher
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PostPosted: Fri Jan 15, 2021 3:23 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

Thanks, I'll order one of those filters.

Butch
 
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woodbutcher
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PostPosted: Fri Jan 15, 2021 3:25 am    Post subject: Re: low oil pressure Reply to specific post Reply with quote

AC-Delco
 
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