Oil pressure

4.0L ,318 or 360 V8?

I would say you have good oil pressure if the needle is in the center or just above. the pressure needle should not be all the way to the left or right.

cold, idling, most V-8s should be around 30 lbs. Hot, idling, about 20. Usually maximum on a V-8 is about 60 lbs, unless you have a high pressure or high performance oil pump installed. Then you can get 80 lbs of pressure maximum... Most V-6 and 4's average about 5 lbs less across the scale...

I had my oil changed at the dealership yesterday and this morningthere was two spots. I have a 2013 Jeep Grand Cherokee and the oil pressure is reading at 38 to 45. temp 171 to 181

If you have a 4.0 jeep engine and having oil pressure problems here what your issue is! The 4.0 cylinder head is extremely bad about cracking across the top of the head near the rocker arm towers. It allows coolant to seep over time and sludge the oil causing low oil pressure at idle around zero and higher pressure while driving. I just pulled my engine to rebuild it and the oil looked like sea weed. The machine shop I use all the time said the 4.0 heads crack all the time. I found a company the remanufactured new heads that are stronger and thicker where they crack all the time. Go to my website send me an email and I'll give you there info. bigasautorepair.com just click on contact us. Hope this helps!

My grand Cherokee 4.0 has 258,000 miles and the oil pressure is 40 at idle hot or cold and 45 at speed hot or cold. Change the oil no difference I am using Rotella 10W-40

Allynnc, 40 psi at idle and 45 psi while driving is a good oil pressure for the 4.0 liter Jeep Engine. My problem was my oil pressure was dropping to 0 psi at idle and the problem was coolant was seeping from the head because it was cracked, so I rebuilt the engine and it is fine now. 60 psi at idle cold and 40 psi at idle warm. I had know Idea it was a coolant and oil sludge problem until I sent the head to the machinist and he said the 4.0 heads crack because of a thin layer of cast across the top of the head. I found Titon Engines who had recast the heads and built the up in that weak area. My jeep is running and the oil pressure is better then is was before I pulled the engine and rebuilt it. Thanks

You have to have pressure to have flow. At higher RPMs your pump is working harder and your pressure should go up. You definitely need some pressure at lower RPMs or you are starving your engine. If your pressure does not change with RPM then there could be a restriction. For example a clogged oil filter will increase your oil pressure. My jeep has 110,000 miles - just changed the oil and filter. I get 30psi at idle and around 40psi going down the road. What you want is flow at all points in the engine.

I have 260,000 plus miles and was getting 37 at idle and 49 at rpm. I changed the pressure sensor because I didn't believe how high my idle pressure was and now get 41 at idle and 49 at rpm (higher than with the old sensor). Recent oil change. It leaks a little but stays on the full mark on the dipstick for over 3,000 miles with some tappet noise at idle when cold. I am using Rotella 10w40 because it has zinc not in standard car motor oil, but still in diesel oil to protect the tappets.

i have 830.000 plus mile haven't change oil in two years and she runs like shes new.

I have a 2000 jeep grand Cherokee with a v8 sitting still the oil is showing 60 psi running down the road its showing 80 psi

Bigasautorepair I have a 03 grand Cherokee, oil pressure varies, the gauge will sometimes drop to 0. It has a new head and lifters, new oil pump too. I replaced the oil pressure sensor but problem still remains. So I connected a manual gauge to see what is actually happening. The oil pressure does drop out but seldom below 10lbs. But my guard on the instrument panel is showing over mid way and climbs when accelerated. Is the an oil sensor plus sending unit? I would think I’d have nothing on my gauge when sending unit is disconnected. Also my scanner is showing 39+ lbs....

I have a 2003 Overland Grand Jeep Cherokee 4.7l V8 and also had low oil pressure. One of these websites suggested to reaplce the oil sending unit located above the oil filter. Did that and still had low oil pressure at idle. Another site suggested to blow out the oil galley by removing oil sending unit and cranking the motor just in case of any blockages. Did that too but what a mess that makes, still did not do the trick. had my radiator replaced because there was a water leak and still did not help. We then discovered that the thermostat does not open and hence the ooil gets to hot hence the oil pressure drop when car is hot and idling. Had thermostat removed and had since not had any problems with oil pressure.

I have a 2016 Grand Jeep Cherokee 14,000 miles suddenly the oil temperature slowly move up to 203 degrees F, the gauge was at 11: 00 clock. What is the normal running temperature and what can cause a sudden temperature rise.

how do I know if my jeep pressure is on my 1997 jeep Cherokee

4.0 liter, inline 6. 280,000 miles and I'm still running 40 psi at idle and 50 psi running. I did run kerosene through the engine, then cheap oil and filter with Marvel Mystery Oil. Good engine flush. Replaced with Mobil 1 synthetic and a Fram filter. No issues

Is it ok if the oil pressure is that high in compare with the coolant? Its a jeep grand cherokee diesel 2.7 2004. Thanks