xPlover24x

i wouldn't call myself nervous but while my 4.0 is running, the oil pressure needle is steady between 60 and 80 psi. should ijust change the oil or is there a bigger problem here?

freegdr

its cold out your oil is thgicker its going to have greater pressure

xPlover24x

well it did it in november when i had that big heat wave and it was the same

mrfajita

Mine is usually there when I first start it, then after it warms up, drops to around 40 at idle.

freegdr

try an oil change could not hurt

jayman089

Does it fluctuate at all with the rpm's?

Could be a bad oil pressure switch. I replaced mine recently when my oil pressure gauge stayed solid around 80psi.

All is good now.

xPlover24x

yeah it moved a lot

tjwalker

Replace your oil pressure sending unit. It is a VERY common failure on the 4.0. When they fail, they usually read abnormally high readings.

I recommend purchasing this part directly from Jeep for best reliability/accuracy/mating with your factory gauge.

xPlover24x

ok thanks

jayman089

Just an fyi, when you look for the part, it may be labeled "oil pressure switch" or "oil pressure sender." It's the same thing. I picked mine up from Advance Auto for around $45.