Question about 1993 Jeep Grand Cherokee

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My jeep has the straight 6 and 260,000 miles. The oil pressure appears very low while at idle. However when I accelerate, it comes up. It is running fine, but I know oil pressure issues can be a potential problem. Where should I start?

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  • sat1425 Jun 28, 2009

    Thank you your replies. I will apply both of your suggestion and get back to you.

  • sat1425 Jul 01, 2009

    Maintuser....I talk to you about low oil pressure in a high mileage Cherokee jeep. I tried your suggestions and it worked great. Pressure came way up almost 20 psi.




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It's common for high milage (over 150,000) engines to have a low oil pressure at idle.You could change the oil pump and it should improve.
Check for signs of leaks around the sump, head gasket etc.

Posted on Jun 27, 2009

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Well this is pretty normal for the mileage you have i suggest you switch to a heavier weight oil or what i do is add a quart of lucas oil treatment with each oil change that stuff is amazing i have seen it stop oil leaks and stop smoke from the tail pipe and it will raise your oil pressure 10 to 15 psi.

Posted on Jun 27, 2009


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A low reading of 20psi is not dangerous. As an engine wears, clearances increase and allow some oil to escape out the sides of the bearings. Even at 15 psi you would still be OK.
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If you are using any 5w oil (except synthetic) discontinue using it. Even in colder climates, most engines don't need anything that thin. Most synthetic oils are thinner than conventional lubricants and will give low that case, it's not a problem because they are so far superior that there is no sacrifice in protection.
As far as the difference between at idle pressure and at speed pressure, that is normal. Your oil pump is driven off the camshaft. As the engine rpm's increase the pump spins faster, giving you higher pressure as needed. When I build any engine, I always use a high pressure high volume pump. Even with those, idle pressure is lower than driving pressure and pressure always becomes slightly lower as the oil heats up.
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Oil pressure shows low (nearly zero) when idling after running for awhile, returns to normal when accelerating

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