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Old 09-01-2012, 01:24 AM   #1
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oil pressure readings

01 3.8 camaro. Here lately, my oil pressure has dropped to about 40 when cruising and 30 at idle when fully warmed up. Using 10-w30 valvoline full synthetic oil. Also has been hot and humid lately (usually in the high 80s). Is this a normal psi for the comditions?
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Old 09-01-2012, 09:31 AM   #2
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Should be around 40 at idle and 60 cruising. Are you loosing oil via rms or another leak? Only reason mine drops is a bad rms and i have your current weather.
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Old 09-01-2012, 12:30 PM   #3
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Well...last year when it was on a lift, the mechanic told me the rms was leaking slightly. How hard would that be to replace?
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Old 09-01-2012, 12:46 PM   #4
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Im guessin mine is even worse cause at idle warmed up bout 210 my oil pressure is right at 20 then goes to 30-40 when im driving
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Old 09-01-2012, 12:48 PM   #5
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Quote:
Originally Posted by jasonh3609
Well...last year when it was on a lift, the mechanic told me the rms was leaking slightly. How hard would that be to replace?
There are two ways; pull the motor or drop the tranny.

IMO dropping the tranny is quicker and easier.
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Old 09-01-2012, 01:07 PM   #6
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A leaking rear main seal does not affect the oil pressure.
It just simply leaks oil.
The seal is not pressurized.
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Old 09-01-2012, 01:21 PM   #7
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So is my oil pressure reading bad??
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Old 09-01-2012, 01:25 PM   #8
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Quote:
Originally Posted by 88GTA View Post
So is my oil pressure reading bad??

Well, has it dropped suddenly or has it always been 40psi or so when driving?

40 driving and 30 at idle is pretty good pressure if you ask me.

My T/A is 50 on the higway and 20 to 30 at idle depending on temp.
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Old 09-01-2012, 01:43 PM   #9
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Quote:
Originally Posted by NavyVet View Post
Well, has it dropped suddenly or has it always been 40psi or so when driving?

40 driving and 300 at idle is pretty good pressure if you ask me.

My T/A is 50 on the higway and 20 to 30 at idle depending on temp.
That's what i was thinking. When it's colder outside (fall and winter) it is about 60 driving and 40 idle, which made me think it just had to do with the weather
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Old 09-01-2012, 01:51 PM   #10
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Quote:
Originally Posted by NavyVet

Well, has it dropped suddenly or has it always been 40psi or so when driving?

40 driving and 300 at idle is pretty good pressure if you ask me.

My T/A is 50 on the higway and 20 to 30 at idle depending on temp.
Thats normal for a ls motor, but IIRC 3.8's should be 40 idle and 60 cruising?
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Old 09-01-2012, 02:08 PM   #11
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Quote:
Originally Posted by 01camaro

Thats normal for a ls motor, but IIRC 3.8's should be 40 idle and 60 cruising?
For a 3.8 thats about right. I know if it is Really hot idle is 30 to 40
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Old 09-01-2012, 02:10 PM   #12
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Quote:
Originally Posted by redbird98

For a 3.8 thats about right. I know if it is Really hot idle is 30 to 40
Dang. Its been 90-110 here, winter temp is 40-60, and my idle stays 45 and cruise 60.
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Old 09-01-2012, 02:18 PM   #13
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Quote:
Originally Posted by 01camaro

Dang. Its been 90-110 here, winter temp is 40-60, and my idle stays 45 and cruise 60.
The only time it got that low was when it was 98 degrees and I was sitting in bumper to bumper traffic for an hour.
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Old 09-01-2012, 02:31 PM   #14
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Quote:
Originally Posted by NavyVet

Well, has it dropped suddenly or has it always been 40psi or so when driving?

40 driving and 30 at idle is pretty good pressure if you ask me.

My T/A is 50 on the higway and 20 to 30 at idle depending on temp.
No it drops normally as car heats up bout 210 at idle is 20psi. 40psi or so when cruising i was on highway was at 40psi the whole time about 190 temp just wondering is the normal or a soon to be problem
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Old 09-01-2012, 02:36 PM   #15
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Roughly want 10PSI for every 1000RPM.
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Old 09-01-2012, 03:18 PM   #16
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so the 40 psi while driving is safe?
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Old 09-01-2012, 08:57 PM   #17
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...anyone? ^^^
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Old 09-01-2012, 10:25 PM   #18
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Plenty.
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Old 09-01-2012, 10:39 PM   #19
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Yes that is safe I it ever drops below twenty at idle or cruising or anytime for that matter b looking to rebuild soon but 40 is plenty

Edit: my 97' 3.8 was about 30 idle and 40-60 driving at 210-230 engine temp
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Old 09-03-2012, 12:15 AM   #20
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Tonight my oil pressure was around 38 then after I was driving a little longer it dropped to about 35. I don't know what is going on. It could just be the gauge messing up because its a mechanical gauge. Any thoughts of where I would start if there is a mechanical issue that needs to be solved?
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