What normal Oil PSI?

Discussion in 'Fox 5.0 Mustang Tech' started by BlackFox5.0, Dec 5, 2003.


  1. BlackFox5.0

    BlackFox5.0 Founding Member

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    I just put an Autometer Oil pressure gauge in, and it reads around 65-70psi when driving, and around 50 when at idle.....i just want to know whats normal :)
  2. eastbmx

    eastbmx New Member

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    mine reads about 60 at idle and almost 80psi under throttle.. i have a feeling that is too high, i suspect the gauge or sending unit to be at fault. im just lazy i havent taken it apart yet.
  3. 1990LXDropTop

    1990LXDropTop New Member

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    Hmmmm, mine reads 25psi at idle and 50psi under throttle. Is this too low?
  4. 93 teal terror

    93 teal terror Founding Member

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    no thats about right....if it goes under 20 at idle,i would say you have a problem. Haynes says that 44-60psi at 2000 rpm when warm is normal. Im getting right at 44 and mine at idle is anywhere from 23-28 depending on how warm the car is.

    Blackfox....i see you have a high volume oil pump...this is probably the diff.
  5. stangbear427

    stangbear427 Active Member

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    Right. It totally depends on your mileage too. As a rule of thumb, you are safe with 1psi. of pressure for every 100RPM's; or, if it's easier, 10psi for every 1000. Theoretically, if you're idling at 900 and have 12psi you're still safe. 80psi seems high under any circumstance, in a fully warmed up stang- but as long as you aren't smoking or puking oil out any engine gaskets it should be fine.
  6. Black331Stang

    Black331Stang Active Member

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    ive heard (that mustang 5.0 book)that at 2000 RPM u should be at or around 40 psi...and thats worked out on 3/3 cars so far that ive done it one..so i stick to that
  7. BlackFox5.0

    BlackFox5.0 Founding Member

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    I just put in a mechanical gauge, and I do have a high volume oil pump, but theres a difference between high volume and high pressure, so it should be the same as a stock pump I would assume...Just wanted to know what normal is, so I can tell if I have a problem
  8. grey302

    grey302 New Member

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    you're fine, promise
  9. Black331Stang

    Black331Stang Active Member

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    do the test i said..tell me what it reads..
  10. BlackFox5.0

    BlackFox5.0 Founding Member

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    Can't my car is buried in the snow, no more driving till the roads are dry!
  11. Black331Stang

    Black331Stang Active Member

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    haha me too..but when the roads are dry still no driving :( we are getting smashed pretty good here on LI
  12. Schlodes

    Schlodes Founding Member

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    First off, NON synthetic Castrol GTX 10W30.

    Mine fully hot is about 40 PSI at idle, and around 50 PSI cruising 2000-2500 RPM, and upper RPMs is no more than 65.... Far as I can tell no ones ever had the motor apart.. cause everything is rusty and looks untouched under there. I know the last 2 owners of it since waay back to 1996 when the one had it so.. :shrug:

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