Also has one of you switched out the ring bearings from under the Jeep? Is it as hard as everyone says? I’m thinking if they are worn I may switch them out as well

 

For colder climates you would use the Rotella T6 5W-40 for easier cold cranking along with a quality oil filter like WIX. Return the oil pump back to where you bought it. It will not help! Once you drop the oil pan you are opening up an entire can of worms that can escalate in cost and needed experience very rapidly. Switch oil and filter then leave it alone, it will be fine!

 

All of this.

Also get a different oil pressure tester and do the test again. You never know if you have a bad unit.

 

yeah so ring bearings was typo, i meant rod bearings. i deserved that ball busting. I am not by any means a mechanic but i am competent enough lol plus i will have help. I was just curious if any of you have replaced them while the engine was still in the rig. I appreciate your guys advice, i will try the 5w-40 before messing with anything. id prefer to not tear into it if i dont have to.

 

Replacing rods and mains along with the oil pump will not do much because the real problem is the cam bearing clearance. Problem is, replacing cam bearings is not a simple at home DIY job. The reason for specifically recommending "Rotella T6 5W-40" is because it is a full synthetic and contains the highest level of ZDDP of any oil currently on the market which is good for reducing wear on the cam and lifters in addition to the higher viscosity which will increase the oil pressure. The low oil pressure is a VERY common issue with these engines and comes up with nearly every new owner. I purchased my XJ about 6 months ago and it had the exact same low oil pressure issue. I switched it to Rotella T6 5W-40 and a WIX filter and I don't worry about it any more. Do a search for 4.0 low oil pressure.

 

Mine has loved that stuff for the last 2 1/2 years I've had her... Rotella T6 is delicious and it does a lot of good for our old 4.0's. I've seen the proof in the blackstone report comparisons. Can't argue with facts.

 

Fact is, the guy I bought my XJ from must have gotten scared about the low oil pressure since he only had it for 3 months and the Haynes manual he left in the back had greasy fingerprints on the "Oil Pan Replace" pages. He probably put a pump in it and it didn't do a thing. When I bought it, it had 20 psi cold and dropped to 5 hot. Replacing the pressure sensor brought it up to 40 cold and 15 hot. Rotella fixed the rest.

 

Before you do anything buy or borrow a mechanical oil pressure gauge. My dash reads 10 at hot idle but with a mechanical gauge about 20.

 

lol got to love that. Mine hot idles at 9-10 psi and down the road think it was 50-60 psi checked with mechanical gauge also. Even after doing the oil port cleaning at the pressure sensor, replacing sensor (leaking oil anyway) and using a wix filter and T6 15w40 pressure stays the same. Mine is the 2000 and someone has possibly changed out the head as the fuel injector wires are labeled and when I removed the valve cover did not see a 0331 think it was either a 06## or a 07## and looking thru the oil filler hole you don't see anything. Motor is not too noisy and just gonna drive it till it dies...if it ever does.

 

If it didn't have a gauge, but a light instead, would you worry about it? Do you have any cars that only have a light? Does it bother you, that you don't have a gauge in the other car(s)?

Personally, since you switched the oil pressure sensor & you got a more favorable reading, I'd leave it alone and spend your money on better things for the Jeep.

But, if you so desire, do as others have said, put a known good mechanic gauge on it & see where you are at.

I'll agree with what someone else has mentioned, you are opening up a can of worms here.

Also, if you do drop the oil pan, don't forget to consider replacing the Rear Main Seal.

 

thank you all for the reply! I am doing the oil change today with T6 5w-40 and got a wix filter. I’ll update you when it’s done.

 

Unless you're that OCD about your vehicle, you can use the other Rotella blends that work just as well. They still have the additives you're looking for in the oil. I didn't want to pay the price tag for T6, so I got T5, the blend, and saved some cash. Or as you know there is the T4 dino oil. That is unless you're looking for extended service interval with the oil change by using T6.... Just my $0.02...

Oh and................ oil pressure problems = OPP.

Who's down with OPP?

 

You don't have to use Rotella either, other brand diesel oils work just fine. I'm using the tractor Supply brand in mine.

 

Agreed. I think sometimes the subject of oil is entirely over thought and discussed to lengths that doesn't apply to 90% of us for daily use or off-roading. Yes it is certainly good information, but we don't drive big rigs towing 50,0000 lb loads, or race up Pikes Peak revving the motor to 10,000 RPMS, or take an XJ down a 1/4 mile strip at 134 mph in 11 seconds.....

I understand people like to take care of their vehicles, and to each his own. But using a quality oil that's proven to protect a vehicle along with a filter that's proven to filter and changing the oil when its supposed to be changed is certainly sufficient.

If anyone wants to see a really good video on the comparison of oils, go check out Project Farm channel on youtube. He does very good tests on several oil brands, including Amazon basics...

He also has amazing videos of other products he compares. And he is not sponsored by any of the companies, so his tests and opinions are unbiased. I love his channel and use it often to decide what I'm going to buy while I'm at Home Depot, AutoZone, or whatever else.

Sorry I kind of hijacked the main point of this thread.....

 

All oil brands have to meet the same standards so any of them are fine to use. Oil filters aren't regulated like oil is so I always recommend buying a quality oil filter, I mostly use Motorcraft, but Mopar, Wix, and Purolator are good also.