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Oil Pressure: How low is too low?

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Old 02-19-2024, 01:09 PM
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Old 02-19-2024, 03:44 PM
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Originally Posted by moparnocar23
as per chrysler service information minimum oil pressure is 4 psi at warm idle. and 25-80 psi at 3000 rpm.
That's great except OP didn't inquire about a Chrysler. See tjwalker:

Originally Posted by tjwalker
Oil pressure spec. for the Jeep 4.0 is this:

*Not less than 13 psi at HOT idle
*Between 37-75 psi over 1600 rpms

1990 FSM:




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Old 02-19-2024, 05:51 PM
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What Dave just posted above is for the 2.5l engine. For the 4.0l and 5.9l engines, the FSM says a minimum 13 psi at 600 rpm, and a range of 37-75 above 1600 rpm.
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Old 02-20-2024, 03:50 AM
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Originally Posted by lawsoncl
What Dave just posted above is for the 2.5l engine.
Ooops.

Try this:


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