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Old 05-06-2005, 03:36 AM   #1
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Default oil pressure question on 5.7 vortec

I have a 1997 2 door Tahoe with a 5.7 V8. Hot idle oil pressure is about 18-20 psi and driving is around 40psi. Is this a normal safe range? The engine has 105,000 miles on it and runs great!

What are your 5.7's oil pressure readings? Thank you!
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Old 05-06-2005, 11:29 AM   #2
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That's pretty normal. I replaced the engine in my uncle's '96 pickup and he had the same question, but he didn't watch the gauge before when he ran the old engine out of oil.
My trucks have always been that way. Just check your oil every few weeks, or more if you drive alot, And watch for leaking oil lines.
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Old 05-06-2005, 11:58 AM   #3
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What filter are u using? Only use AC Delco they are the best. If your using a fram tough guard get rid of it. It is only made for 10W-30W and thinner oil.
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Old 05-06-2005, 12:46 PM   #4
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I usually use WIX but recentyl did a few quick oil changes to flush out the engine after an intake manafold repair. I'm using cheep Wal-Mart Supertech oil filters for the flush. Supertech are made by Champion Labs and according to www.bobistheoilguy.com they are very good filters for the money, much better then Fram. I'll go back to WIX soon though.
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Old 05-06-2005, 12:50 PM   #5
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Quote:
Originally Posted by Muffracing
That's pretty normal. I replaced the engine in my uncle's '96 pickup and he had the same question, but he didn't watch the gauge before when he ran the old engine out of oil.
My trucks have always been that way. Just check your oil every few weeks, or more if you drive alot, And watch for leaking oil lines.
Was the engine you put back into your Uncles truck a new engine? It's oil pressure is also that low? Why did it need to be replaced? I'm trying to find out how much life these 5.7's have, mine now has 105,000 and seems to be running strong.
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Old 05-07-2005, 07:49 PM   #6
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Quote:
Originally Posted by SkagSig40
Was the engine you put back into your Uncles truck a new engine? It's oil pressure is also that low? Why did it need to be replaced? I'm trying to find out how much life these 5.7's have, mine now has 105,000 and seems to be running strong.
It was a used engine with about 100k on it. And the pressure is about 20 psi at idle. You should be good for a long time. I've seen lots of 350s with 150k still running strong and a few that have passed 300k. Just keep up the regular maintenance.

His oil lines were leaking, the intake was leaking a small amount into the engine, and he had the oil changed at Wal-mart and they did not screw the filter on tight. I spun the filter off with my hand. He ran it out of oil.
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Old 05-07-2005, 09:13 PM   #7
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Quote:
Originally Posted by Muffracing
It was a used engine with about 100k on it. And the pressure is about 20 psi at idle. You should be good for a long time. I've seen lots of 350s with 150k still running strong and a few that have passed 300k. Just keep up the regular maintenance.

His oil lines were leaking, the intake was leaking a small amount into the engine, and he had the oil changed at Wal-mart and they did not screw the filter on tight. I spun the filter off with my hand. He ran it out of oil.
I was leaking coolent internally and had the intake fixed. Had the oil analized and it came out ok but did show some coolent and the 1st sign of an intake manafold going bad. So far the coolent has not droped at all in a week.
I hope to get at least 250,000 out of her.
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Old 05-12-2005, 12:30 AM   #8
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Quote:
Originally Posted by SkagSig40
Was the engine you put back into your Uncles truck a new engine? It's oil pressure is also that low? Why did it need to be replaced? I'm trying to find out how much life these 5.7's have, mine now has 105,000 and seems to be running strong.
got 140k hard miles here. No engine probs at all, just alternator and tranny.
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Old 05-12-2005, 12:08 PM   #9
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Quote:
Originally Posted by BeefTip
got 140k hard miles here. No engine probs at all, just alternator and tranny.

What is your oil pressure at hot idle and while driving?
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Old 05-20-2005, 06:11 PM   #10
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A regular smallblock Chevy from what I've seen tends to run a little lower pressure than an LS1. I sold my grandpa's 99 Blazer with 23k on it last year, and during the time I had it and was driving it, it would run around 45psi warm cruise and about 22psi hot idle on 10w30 oil. It would go up to around 50-55psi WOT but no more. Most of these motors have a pressure relief spring in the oil pump that engages around 60psi.

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Old 05-21-2005, 04:44 PM   #11
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I own a 97 small block vortec (383 though) and my oil pressure reads 60psi at startup, 40psi at idle, and 50-60psi at cruise. I use 15w-40 Schaeffer's blend oil, and Baldwin oil filter. If you are worried about pressure go to a 15w-40...especially if you live in a warm climate.
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Old 05-21-2005, 09:46 PM   #12
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I'g going to try German Castrol 0w30 which is a very thick 30w-almost 40w oil and has been showing incredible results in almost ever car that uses it. You can read up on it at www.bobistheoilguy.com.

Sence it is pretty thick it should help a bit although it sounds like my oil pressure is normal at those readings from what you guys tell me. Thank you!
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Old 05-21-2005, 10:50 PM   #13
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I'm on that board also, and was one of the first to try that oil as well. Great oil, but UOA's showed that it wasn't for me. Good luck, and your oil pressure should go up a little. Let us know what it reads after the change.
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Old 05-22-2005, 04:12 PM   #14
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Quote:
Originally Posted by silverado
I'm on that board also, and was one of the first to try that oil as well. Great oil, but UOA's showed that it wasn't for me. Good luck, and your oil pressure should go up a little. Let us know what it reads after the change.
What engine did you run it in? I'll post my UOA on it in another few months.
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Old 02-21-2006, 12:18 PM   #15
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I have a 97' Gmc 5.7 vortec with 124,000 on the dial running 5w30 maxlife im getting 25 psi warm and 50 to 55 psi at 55 mph using a K&N oil filter. But you can't trust a gauge they can be 5 to even 10 psi off from actual just run good oil and check it every time you fill up if it isn't knocking don't worry about it. Just my opinion
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Old 02-21-2006, 12:18 PM
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