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oil pressure

This is a discussion on oil pressure within the General Help forums, part of the LSx Technical Help Section category; im pretty sure at highway speeds I had like 60lbs of oil pressure now I have 40 when should I ...

  1. #1
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    white
    2000 trans am

    oil pressure

    im pretty sure at highway speeds I had like 60lbs of oil pressure now I have 40 when should I start to worry

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    It depends on rpm mostly.


    on stock pump? Should be around 30-40 @ idle & IIRC 10 psi for every 1000 rpm above 2000rpm.


    FBJ or Cutlas will know for sure.

  3. #3
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    white
    2000 trans am

    stock pump it starts out at 60 till the car comes up to normal temp then doesn't go over 45lbs even on the highway doing 70mph. i gess its getting tired has 150,000 miles on it. I just used to see it at 60lbs more often.. its time for a oil change anyway any suggestions
    Last edited by jodmari; 02-03-2015 at 08:20 PM.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Try to cut open the filter and drain it in a clean pan. See if any hints of metal (maybe run a magnet through it) or bearing material.

    Oil weight could also effect pressure readings but not too much between 5W-30 to 10W-30. Now 20W-50 or some race oils then yeah, but I doubt you are running those.


    If you do decide to go ahead and change the oil pump, either LS6 or Melling 10295 are great options. I wouldn't bother with the Melling 10296 unless you're going to do a cam upgrade as well. Stock or mild bolt on's wouldn't benefit from the high output/high volume.



    150k miles isn't too bad, your car is 15 yrs old. Plenty of LS motors getting above 200k. Only reason I killed my LS1 was because I was abusing it and it caught me. (Over Rev'd on a burn out, hit the rev limiter twice).

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