Originally Posted by tinytrax78

as a general rule 10 psi of oil pressure for every 1000 rpm will b fine so run it till it blows up

Originally Posted by jesse jay

I have an 89 Cherokee with a 4.0 inline 6, when its cold ill start it up and the oil pressure will be where its supposed to be at 45 but as it warms up the oil pressure drops till it hits like 5 to 10 or even lower the farther I drive, when I give it gas it goes up to maybe 20 but when I come to a stop it idles around 5. the engine will rattle too, only when the oil pressure is down that low when its cold it sounds like a champ, or even when its warm and the oil pressure is low, and I step on the gas it wont rattle. what could the problem be?

Originally Posted by cruiser54

First off, make sure you do not use fRam oil filters. Use Wix or Napa Gold which are readily available.

Here's an interesting read about fixing low oil pressure readings. It may or may not be your problem but you might fix it with a pipe cleaner:


http://www.jeepforum.com/forum/f19/4...fixed-1304679/

Originally Posted by Bertxj954

I had to replace my sending unit twice. Must have been a faulty one from the factory. Runs fine now