Anyone know what is considered normal oil pressure for 3100? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-17-2006, 12:21 AM   #11
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Quote:
Originally Posted by DarkShadow
ok im pulling up

1100rpm-15psi
3000rpm-30psi
900rpm-10psi

from alldata for the 1999 Oldsmobile Cutlass 3.1 Vin J & M

Great, thank you for the info, puts my mind at ease. Thanks for all of you help!!!! I was worried it was low. Thanks again!
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Old 01-17-2006, 12:37 AM   #12
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Actually they would replace the pistons, not the engine. I was becoming a fairly routine operation at the dealer I bought mine from ( my buddy is in the service department).


That oil pressure sounds to be around what I get on my 2003 Malibu. Now I have a cheap electronic gauge and want to get a better one. I think my sending unit ( that came with the cheap gauge) is not that accurate since I do get a jumpy oil pressure. What do you expect for a 10$ electronic gauge, lol.
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Old 01-17-2006, 12:50 PM   #13
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As Shawn stated this is not a 3800 engine...

3100 is a Chevrolet engine...

I merely stated what the service manual was looking for...

Most chevrolets I have seen all seem happy from 20-60 Psi...

Usually after a good rebuild we see 40-60 Psi on the 305'*, 350'* and 400'*... Thats not a high volume oil pump either... With hot idle they do drop to 30 Psi... On just about every chevy I have seen the oil pressure is a huge problem wne the engine is hot and the pressure tanks as the engine warms up...

If that 3100 is getting 25 Psi at idle and 40-50 above idle( Hot ) I don't think i'd be worried about it.. I have seen 3.1'* with almost 300K with oil pressure like that and they still ran silent...

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