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What should oil pressure be on factory gauge?

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Old 03-04-2008, 01:40 PM   #1
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Question What should oil pressure be on factory gauge?

I have a 97 Sonoma with the 2.2. What should my oil pressure be at:
-startup (cold idle)
-Warm idle
-highway speed
?
Old 03-04-2008, 02:31 PM   #2
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Re: What should oil pressure be on factory gauge?

It's not a sonoma or a second gen but my '91 s10 (4.3) stays around 40 (Half on my guage) when idling cold AND warm. Driving it will stay about the same or a little higher then go back to about 40 when i come to a stop.
Old 03-04-2008, 03:02 PM   #3
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Re: What should oil pressure be on factory gauge?

mines always on the right side on the last line exept when ideling
Old 03-04-2008, 04:57 PM   #4
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Lightbulb Re: What should oil pressure be on factory gauge?

thanks, and more details please

Mine is like 3/4 guage when cold, a little over half at highway speed, and just under 1/4 guaeg at warm idle.
What spooks me is the low warm idle. Its a 2.2 with 110k on it, should 5w30 be fine to run year round as the manual suggests?
Old 03-04-2008, 05:20 PM   #5
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Re: What should oil pressure be on factory gauge?

like 70 start up , warm like 60 area id say then at idle it may drop to like 40
Old 03-04-2008, 05:22 PM   #6
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Re: What should oil pressure be on factory gauge?

added to my last post mines a 97 s10 2.2
Old 03-04-2008, 09:13 PM   #7
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Re: What should oil pressure be on factory gauge?

97 2.2 124k start up its just over the 3/4 mark, driving at operating temp its about half and warn idle its just below the 1/4 mark.
Old 03-04-2008, 11:49 PM   #8
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Re: What should oil pressure be on factory gauge?

Quote: Originally Posted by beatcars
thanks, and more details please

Mine is like 3/4 guage when cold, a little over half at highway speed, and just under 1/4 guaeg at warm idle.
What spooks me is the low warm idle. Its a 2.2 with 110k on it, should 5w30 be fine to run year round as the manual suggests?
I only run 10w30 in mine.
Old 03-05-2008, 08:20 AM   #9
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Re: What should oil pressure be on factory gauge?

hmm... so we have one person with much higher oil pressure than myself and another person. Are we all three using 5w30? Are there any mechanics on the forum who cuold say if Laydout and I are in danger of low oil pressure? Maybe its the filter we use?
Old 03-05-2008, 02:35 PM   #10
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Re: What should oil pressure be on factory gauge?

i cant remember what oil i used in mine but mine also is a complete rebuilt motor with new oil pump so mine may be a bit higher i think i only have like 3 miles on my motor i never even drove it on the rode yet
Old 03-05-2008, 11:17 PM   #11
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Re: What should oil pressure be on factory gauge?

Good rule of thumb that I've followed for over 40 years is 10psi per 1000rpm hot. If it's idling warm and has 15psi you're ok. Anything over that is dessert. Viscosity of oil WILL change between cold and hot causing the pressure to change @ a given rpm. Volume DOES NOT CHANGE @ a given rpm unless there is a pressure change. Multi weight oils will have a larger change than a single weight oil for the above reason.

Cheap mod is to take and put a "T" inline @ the block and put a mechanical gauge there and leave it. You can then compare readings on the mechanical with the dash gauge @ different times and conditions. If the readings are within 5psi then I'd not worry too much about the dash gauge being "off". It's about as accurate as your gonna get from a mass produced, lowest bidder item.

Larry

Last edited by torskdoc; 03-05-2008 at 11:18 PM.
Old 03-09-2008, 10:33 PM   #12
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Re: What should oil pressure be on factory gauge?

My parent's S-10 with 2.2L always stays around 60 psi.
Mine with a 4.3L stays around 40 psi....depending. I used 5w30 with some lucas oil.
Old 03-09-2008, 10:49 PM   #13
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Re: What should oil pressure be on factory gauge?

My 95 2.2L reads like the other with hot idle just under 1/4 scale. I'm using 5w30 Kendall & an AC filter. GM used to say anything over 7 psi is fine.
Old 03-10-2008, 07:19 PM   #14
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Re: What should oil pressure be on factory gauge?

Mine has read up to 8o-psi cold. But usually about 60-70 cold. At idle it drops down to about 10. And as soon as I give it gas she climbs to about 50 psi driving down the road.
Old 03-10-2008, 09:00 PM   #15
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Re: What should oil pressure be on factory gauge?

i use 10w30 and an ac delco filter, i just changed my oil before going to pc, so now i have about 700 miles on the oil. oil pressure is still the same.
Old 03-10-2008, 09:16 PM   #16
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Re: What should oil pressure be on factory gauge?

95 2.2 70 cold,40 highway, 20 warm.and i run 10/40 oil
Old 03-10-2008, 09:20 PM   #17
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Re: What should oil pressure be on factory gauge?

mine hits 80 every time if i get on it when its cold but warm idle is like 35 , driving pressure is like 45 or 50
Old 03-10-2008, 11:01 PM   #18
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Re: What should oil pressure be on factory gauge?

Thats typical for older s10's or sonomas that have high mileage on them....i have a 2.2L Noma...And When i start mine dead cold in the morning it gets up to like 75 psi, warm up/idle after 15mins start up like 40-45 psi...then once the engine gets warm...it drops to the min about 10psi or 15 once at warm idle, goes back up to 45-55psi when driving ...but nothing less then 10....As long as ur gauge doesnt go to the orange your fine...ive seen a boat load of vehicles especially old ones with a bunch of mileage.

Anyone with a 2.2L or any other engine for that matter should run 5w30 oil, you only need to run 10w30 or thicker oil in colder climates if u live up north...!

<Valvoline 5w30 Maxlife 75k+, substitute a quart w/ Rislone...works great!
Old 03-11-2008, 04:21 PM   #19
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Re: What should oil pressure be on factory gauge?

Let me revise that previous post it gets down to like at the most 20psi at warm/idle!
Old 03-24-2008, 04:10 AM   #20
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Re: What should oil pressure be on factory gauge?

Rislone?? my dyme also idles at about 20psi hot and 45 - 50 at highway speeds she has almost 190, on her.what is Rislone can it help with this? she also smokes a little at start up any help
Old 03-24-2008, 07:38 AM   #21
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Re: What should oil pressure be on factory gauge?

There is a bit of apple and orange comparison going on here. Cold readings depend greatly on temp,basic viscosity and even a hundred rpm can make a huge difference. Regular running temps at identical rpm and basic viscosity need to be used for comparisons. Stick shift cars and automatics are generaly different in basic rpm at idle, so even this can be a great variable.

Basic viscosity is not measured the same for all multigrades either. Different brands use different methods for establishing their bottom line number. I looked up several articles on the subject a few years ago and there is not a single standard in use yet as far as I know, even though it looks good on paper, large variations DO exist.

Oil filters are built with a pressure relief valve that has about a three cent part with 20% tolerance, so top end pressure at cold starting may well be completely different from one filter to the next by 5 to 8 pounds on the same vehicle. Even within the same brand filter and oil.

The addition of a factory oil cooler changes the readings, generally raises the pressure.
Old 03-24-2008, 04:49 PM   #22
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Re: What should oil pressure be on factory gauge?

True ya sounds like we are all ok.
A note to that 5w30 statement... its 5w30 you want when its cold out, you can run 10w30 in warmer climates or times of year. But I don't think there is a need unless you are trying to stop burning or leaking because 10w30 is just slightly thicker.
Old 08-29-2011, 04:33 PM   #23
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Re: What should oil pressure be on factory gauge?

Quote: Originally Posted by beatcars
hmm... so we have one person with much higher oil pressure than myself and another person. Are we all three using 5w30? Are there any mechanics on the forum who cuold say if Laydout and I are in danger of low oil pressure? Maybe its the filter we use?
the low oil pressure will soon wipe out your main bearings thrust washer and cam bearings . at my shop we just finished a overhaul on a 2nd gen 2.2 liter no flex fuel with low oil pressure complaint. it was about 12 to 16 psi at idle and 35 psi at crusing speed. the only way to tell if you have bad mains is to pull the engine, and plastic guage the oil clearance . hope this helps M-260165 Macs-1111189 ASE ivonq4sjbasha
Old 08-29-2011, 04:38 PM   #24
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Re: What should oil pressure be on factory gauge?

i dont know exactly what weight oil is in mine cause i bought it from a dealership and havent put enough miles on it yet to warrant a change. my gauge is usually around 50-60 when cold once it warms up 1/4th at idle 40 or a tiny bit over at highway cruising. got 134xxx miles on it
Old 08-30-2011, 06:16 PM   #25
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Re: What should oil pressure be on factory gauge?

It is normal that oil pressure will drop a little as the engine collects more miles due to bearing clearances increasing. As someone else mentioned, and I believe it to be solid information, you need to see at least 10 psi per 1000 rpm. So at hot idle, 10-20 psi is fine. Driving hot, 30-60 is fine. Cold will usually max out the pressure and put it into bypass.

Here's what I would do. I'd use factory recommended weights (10-30 or 5-30). Note the pressures under different driving conditions such as outdoor temp and engine temp. If the pressure seems to stay consistent with these different conditions, then that is a good sign. If you start to see the pressure significantly drop out of your engine's range or out of the 10 psi/1000 rpm range, then you may have some bearings that are starting to fail or wear out or maybe a bad pump. If you start to get some rod knock, then it is time for a rebuild.

A note about oil pressure and oil weights. Some guys will put in heavy weight oils to boost the oil pressure. This may boost the oil pressure and look reassuring on the gauge but it may well reduce oil flow. Oil performs 2 main jobs, it lubricates and it also COOLS. If you reduce the flow by putting in heavy weight oil, the flow will drop and the cooling capacity of the oil will also drop. Not good. Again, as long as you are getting 10 psi/1000 rpm, don't worry about it and stick with the factory recommended oil.
Old 11-09-2012, 11:07 PM   #26
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Re: What should oil pressure be on factory gauge?

Never under 55 psi hot or cold idle or freeway on my 99 2.2L
Old 11-15-2012, 11:21 AM   #27
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Re: What should oil pressure be on factory gauge?

Quote: Originally Posted by inthe9's
Never under 55 psi hot or cold idle or freeway on my 99 2.2L
That sounds like something is wrong. Idling warm at 55 is too high IMO.
Old 11-18-2012, 06:16 PM   #28
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Quote:
start up its just over the 3/4 mark, driving at operating temp its about half and warn idle its just below the 1/4 mark.
This has been my experience with my 94 and 01, and my friends 98, all 2.2 manuals, all running 5w30 year round and regular fram filters. It seems pretty sketch at first if your coming from modern cars where all the gauges stay pinned at optimum values, but I can assure you it's normal.
Old 11-19-2012, 12:16 AM   #29
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Re: What should oil pressure be on factory gauge?

I'm at almost 80 at startup on a 50 degree day.
Old 11-19-2012, 12:26 AM   #30
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Re: What should oil pressure be on factory gauge?

my 2000 2.2 with 114,000 on it runs 75 cold 40 warm and 60 on the highway.
Old 11-19-2012, 11:03 PM   #31
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Re: What should oil pressure be on factory gauge?

My 2002 Blazer and my old 94 S-10 and 2001 s-10 all hovered around 40 when cold, and idle, and then what I'd imagine to be 60 when pushing the pedal.
Old 09-04-2013, 07:55 PM   #32
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Re: What should oil pressure be on factory gauge?

I have a 94 2.2 with 140000 on it... doesnt burn a drop hardly but pressure has never been above 10 at warm idle... ( I bought it with 90000 on it ) on 95 day sometimes around 8... up to around 40 at cruisin speeds...best 1300 bucks I ever spent but just can't find this cotton pickin vacuum leak..... affecting my blend doors, thus, a/c temps..... code 32 also... any ideas ? sorry to get off track here
Old 09-05-2013, 04:46 PM   #33
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Re: What should oil pressure be on factory gauge?

As regards to your oil pressure, it's fine. If you read up a few posts, someone said that GM claims as long as it stays over 7psi, you're okay. In my eyes, I would be okay with 8. I like mine lower. Mine stays around 9-10 at idle totally warm.
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