Oil Pressure After Oil & Filter Change

[guckingfuy]

I have a 4 cyl and just did an oil & filter change.

after finally connecting my oil pressure gauge

I get a reading of around 55 and when accelerating it climbs about 10 psi.

 

my question is what is the psi supposed to be at idle? The search isnt working out.

[ftpiercecracker1]

That sounds pretty high, but i am no 2.5 expert. For the 4.0 i know 40 psi is ideal.

[jimoshel]

First thing to do would be to check the pressure with another gauge, preferably a standard or one that's been calibrated and compare readings. My DD 2.5 reads 40PSI regardless of revs.

[Zenobian_84]

I have a 4 cyl and just did an oil & filter change.

after finally connecting my oil pressure gauge

I get a reading of around 55 and when accelerating it climbs about 10 psi.

 

my question is what is the psi supposed to be at idle? The search isnt working out.

Doesn't sound too far off from mine. Usually fluctuates at around 40-50 when idle and stays around 40-60 when running after it's warmed up. I believe most of the time it's around a constant 55 psi (running, not idle).

 

I'd follow Jim's advice though; doesn't hurt to make sure it's running at it's peak. :thumbsup:

[mountainman]

Yeah sounds good to me. Over 100 psi you have to worry. Anything under that is great. My 4.0 runs 40 at idle and 60 on the freeway.

These are typical numbers for most engines. I build a ton of engines and i look at specs all day long. Many of my aircooleds run 30 at idle and up toward 75 psi on the freeway.

Honda s2000 is 30ish at idle and needs to be up toward 90 when revved. IIRC.

[Eagle]

Factory spec for the 4.0L and the 2.5L is 13 psi minimum at idle, and 37 to 75 psi above 1500 RPM. Most 4.0L engines with under 100,000 miles will typically run 50 to 55 psi at about 60 or 65 MPH, which is around 2,000 RPM. The pressure should go up a bit as the RPMs increase, so a 2.5L should be expected to run a bit higher due to the gearing. As the mileage adds up, the bearings wear and oil pressure will probably drop.

 

My '88 XJ 4.0L with 287,000 miles on it has been running about 40 psi at highway speed and 30 at idle for several years. No funny noises coming from deep inside the engine, so I just keep on truckin'.