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#3009963 - 05/22/13 03:39 PM 1998 Jeep Cherokee (XJ) Oil Suggestions
George1992 Offline


Registered: 05/16/13
Posts: 7
Loc: Chicago Illinois
Hey guys!

Thanks again for the help on my '98 Ram thread, now I have another question.

I have a 1998 Jeep Cherokee- 4x4

4.0L Automatic - 143,000.

Driven about 50-120 miles a day, about 70/30 Highway City.

Bought the Jeep at 130k, replaced the floors, and did some small engine /suspension work. It seemed to be pretty neglected, and had some decent lifter noise on startup, went away after my first oil change with it.

Been running Mobil 1 10-30 High Mileage with a MOPAR filter for about 4-5k OCI's just because I didn't know the history of the engine.

Does not burn any oil, maybe get a drip or two from the rear main not enough to be noticeable.

Looking for a suggestion/opinion on a lower viscosity oil? Different filter? Would like to stay synthetic, price isn't an issue.

Thanks again fellas!

Here's a picture of it.

_________________________
1998 Dodge Ram - 360/Auto 4x4 - 152k (Mobil 1 10W-30/Mopar MO-90)

1998 Jeep Cherokee (XJ) - 4.0/Auto - 142k (Mobil 1 HM 10W-30/ Mopar MO-90)

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#3009973 - 05/22/13 03:48 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
dave1251 Offline


Registered: 07/15/05
Posts: 8371
Loc: Maricopa, AZ
If what you are using is working I would not change a thing.
_________________________
make the inside of your engine oil cap white.
don't use.

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#3009977 - 05/22/13 03:51 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
Realtech214 Offline


Registered: 02/01/13
Posts: 688
Loc: Florida
A buddy of mine has the same jeep and he uses Mobil Super 5000. His engine runs very smooth and quiet with that oil. It also has 260K miles
_________________________
2015 Silverado Crew Cab 5.3 LT
2001 Suburban LT
- - - - - -
- I NEVER THOUGHT I WOULD LIKE OIL SO MUCH -

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#3009999 - 05/22/13 04:03 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
KCJeep Offline


Registered: 06/30/11
Posts: 6661
Loc: Mahzurrah!
Saweeett looking XJ bud! thumbsup

approved

These engines are spec'd for 10w30 and for good reason, so stay with that over a lower viscosity such as 5w30. It's not so much the operating characteristics as shear is the reason, the 4.0 does not like anything less than a good 30 grade and when the 5w30 inevitably shears it is too thin for optimum protection in the venerable 4.0.

Mobil 1 has consistently produced up to 4 times more iron in UOA's in this engine than just about any other oil, but the best Mobil 1 UOA's have been with the HM version you are using. So I'd suggest you find a new synthetic 10w30, but if you're stuck on Mobil stay with the High Mileage.
_________________________
04 Jeep Grand Cherokee 4.0 139k - Edge 0w40
09 Lincoln MKZ AWD 76k - Magnatec 5w30
12 KIA Sedona 70k - Edge 0w40
09 Ford Focus 121k - QSUD 5w30

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#3010004 - 05/22/13 04:10 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
Miller88 Offline


Registered: 04/09/08
Posts: 11853
Loc: Onondaga County
That XJ is worn out and beat up - you should just donate it to me wink haha - Nice looking Cherokee!

The 4.0s aren't picky about oil. Any 5w-30, 10w-30 or 5/10w-40 will work perfect.

I'm a fan of the larger Fl-1A ford filter in the Cherokee 4.0.

I have been running RT6 5w-40 in mine, last oil change was on a 5w-20/5w-30 blend .... I'm going back to RT6 as I'm due for an oil change.


Edited by Miller88 (05/22/13 04:10 PM)
_________________________
I don't have nice things for a reason

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#3010010 - 05/22/13 04:16 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: Miller88]
KCJeep Offline


Registered: 06/30/11
Posts: 6661
Loc: Mahzurrah!
Originally Posted By: Miller88
I have been running RT6 5w-40 in mine, last oil change was on a 5w-20/5w-30 blend .... I'm going back to RT6 as I'm due for an oil change.


I did a run of 5w20/5w30 blend in mine also, then did a UOA and it was NOT good. frown Too thin IMO. Stay with that T6!
_________________________
04 Jeep Grand Cherokee 4.0 139k - Edge 0w40
09 Lincoln MKZ AWD 76k - Magnatec 5w30
12 KIA Sedona 70k - Edge 0w40
09 Ford Focus 121k - QSUD 5w30

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#3010015 - 05/22/13 04:22 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
George1992 Offline


Registered: 05/16/13
Posts: 7
Loc: Chicago Illinois
Interesting guys thanks,

Now maybe im nuts but I had an FL1A in my garage from an '86 Crown Vic and could not get it to thread on! Am i just an idiot??

That T6 has me interested 5W-40? Will I have to be worried about shearing issues as mentioned by KCJeep? or is that solved by not being a 5W-30 but a 40?

Thanks!
_________________________
1998 Dodge Ram - 360/Auto 4x4 - 152k (Mobil 1 10W-30/Mopar MO-90)

1998 Jeep Cherokee (XJ) - 4.0/Auto - 142k (Mobil 1 HM 10W-30/ Mopar MO-90)

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#3010018 - 05/22/13 04:24 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
KCJeep Offline


Registered: 06/30/11
Posts: 6661
Loc: Mahzurrah!
Originally Posted By: George1992
That T6 has me interested 5W-40? Will I have to be worried about shearing issues as mentioned by KCJeep? or is that solved by not being a 5W-30 but a 40?


Bingo! It will still likely shear, but down to a "thick 30" at most. A 5w30 can shear down into 20 grade range, not a good match for the 4.0. The 4.0 needs at least a solid 30 grade, but will tolerate much thicker oils without apparent issue.

My buddy is running T6 in his XJ as well and really likes it.
_________________________
04 Jeep Grand Cherokee 4.0 139k - Edge 0w40
09 Lincoln MKZ AWD 76k - Magnatec 5w30
12 KIA Sedona 70k - Edge 0w40
09 Ford Focus 121k - QSUD 5w30

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#3010344 - 05/22/13 09:37 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
George1992 Offline


Registered: 05/16/13
Posts: 7
Loc: Chicago Illinois
I think T6 it shall be for the next OC.

Going to do a UOA for this current M1 run (it'll be 6k) just for the heck of it, then the same for the next with T6.

Now provided nothing major shows up in this UOA, 6k with the T6 and a Mopar filter should be ok correct?

Thanks!

George
_________________________
1998 Dodge Ram - 360/Auto 4x4 - 152k (Mobil 1 10W-30/Mopar MO-90)

1998 Jeep Cherokee (XJ) - 4.0/Auto - 142k (Mobil 1 HM 10W-30/ Mopar MO-90)

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#3010356 - 05/22/13 09:51 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
KCJeep Offline


Registered: 06/30/11
Posts: 6661
Loc: Mahzurrah!
Yep. The T6 may be good for closer to 10k but I wouldn't push it that far with a UOA.

A Motorcraft is identical to a Mopar except for the paint and the price. Both made by Purolator. You can't get the "spec" size in a Motorcraft any more, but many guys run the original larger size for that engine which is the very common Motorcraft FL-1A.

Nothing wrong with running the M0-090 either, it does say "Jeep" on it! smile
_________________________
04 Jeep Grand Cherokee 4.0 139k - Edge 0w40
09 Lincoln MKZ AWD 76k - Magnatec 5w30
12 KIA Sedona 70k - Edge 0w40
09 Ford Focus 121k - QSUD 5w30

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#3010397 - 05/22/13 10:36 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: KCJeep]
Troy_Hale Offline


Registered: 10/01/12
Posts: 17
Loc: Cincinnati, Ohio
I look forward to your results. I'm still on the bulk Valvoline 10W-30 that was in the car when I bought it, and am having trouble picking what I'll use next.

You mention the car was neglected, but you must have done a great spit shine job, Jeep looks great!
_________________________
2015 Mazda 3i GT hatch- 39k - Mazda 0W-20
2009 Honda Civic Si coupe - 103k - Castrol Edge 5W-30
2006 Mini Cooper S - 86K - Mobil 1 0W-40

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#3010423 - 05/22/13 10:58 PM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
AmishFury Offline


Registered: 03/30/13
Posts: 132
Loc: Indiana, US
over on jeepforum the most popular oils for the 4.0 are QS Defy and Rotella T5 neither is a full syn but both common recommendations

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#3010744 - 05/23/13 09:24 AM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
jeepman3071 Online   content


Registered: 04/15/10
Posts: 2659
Loc: Storrs, Connecticut
Nice XJ!

Both me and KCJeep have found that our 4.0s run quietest with Pennzoil Yellow Bottle due to the high moly content. I think Pennzoil Yellow bottle 10w30 would be perfect for the 5,000 interval with the Mopar filter, and you'd save a bit more over the synthetic.

I ran Mobil 1 HM 10w30 in my Jeep, and it burned a whole quart in 3,000 miles. It had never consumed oil before that, and once switching to another oil the consumption stopped.

I think for the price, you can't go wrong with Pennzoil Yellow bottle 10w30 or the Rotella T5 10w30. Both are a great oil for the money. thumbsup
_________________________
2000 Jeep Cherokee Sport 4.0L (172k) - PYB 5w30, Wix 51516, Magnefine trans filter

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#3010843 - 05/23/13 10:56 AM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
MrRPM Offline


Registered: 08/25/11
Posts: 437
Loc: Michigan
My jeep had a slight rear main seal leak the 4.0s are known for, nothing left on the ground in the morning but if you touched the area your hand would be wet with oil. After 3 OCIs (early on my 3rd now) of Quaker State DEFY mileage starting at 84k and now at 91k, the Rear main seal is dry to the touch. I haven't run a UOA yet with defy but I wanted to do a few short OCIs with the defy first anyway.
so Far I'm very happy, runs quieter then the fill of m1 0w-40 I used before but really its hard to compare that kind of thing anyway.


Edited by MrRPM (05/23/13 10:57 AM)
_________________________
2001 Jeep Wrangler 4.0L, 5qts Quaker State DEFY 10w-30/1qt kendall GT-1 20w-50, FRAM XG8A (ultra)


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#3010913 - 05/23/13 11:56 AM Re: 1998 Jeep Cherokee (XJ) Oil Suggestions [Re: George1992]
KCJeep Offline


Registered: 06/30/11
Posts: 6661
Loc: Mahzurrah!
I've run Defy once so far and liked it, Jarlaxle did a Jeep 4.0 UOA on Defy as well and it looked really good.
_________________________
04 Jeep Grand Cherokee 4.0 139k - Edge 0w40
09 Lincoln MKZ AWD 76k - Magnatec 5w30
12 KIA Sedona 70k - Edge 0w40
09 Ford Focus 121k - QSUD 5w30

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