i have 235000 miles on my 01 XJ i put a new oil pump in around 120000 miles. Oil pressure is dropping to zero when I stop at a light and when i'm running its just over 20. Do i need to rebuild my engine or do you think its the oil pump again? i do here some slight rattling type noises. any help would be appreciated.

thanks

 

I wouldn't drive around like that. Test it with a mechanical oil pressure gauge

 

This^^.

 

just remember oil pumps dont create pressure they create the flow. bearing clearances are what make the oil pressure

 

Correct.

And that pressure needs to be verified with a mechanical gauge, not relying on the Jeep dash gauge/sender.

 

Like the others said. You need to verify the pressure. It may something as simple as a bad sending unit, plugged sending unit ports or even a crappy oil filter.

 

just curious.. what brand of filter are you running?

 

Ahem......Stealing my material, I see. LOL!!!!!

 

When and from where? Not that noises are unusual for a high mileage 4.0.
Agreed on the mechanical gauge, do that ASAP. Along with changing any bedliner-wearing oil filters you may run into.

 

what?? NEVER!! LOL

Its a legitimate question!

 

I'm using a mopar oil filter

 

One more time!

 

Can't be repeated often enough.

 

ok i will be taking it to a mechanice to check that pressure but in the mean time i changed the sending unit and it seems be holding the pressure. I am going to put in some 15w 40 and i'll change out that filter too. i thin my CAT is shot too or its the bearings in the motor LOL who knows thanks everyone.

 

Oh no........not 15W40.