Recent Topics
Please, maintain your tires properly
by 53' Stude. 09/25/18 06:58 AM
Cycling health
by CourierDriver. 09/25/18 06:08 AM
Stupidest thing you've ever done (or not done)
by Speak2Mountain. 09/25/18 06:01 AM
First Time Hyundai Owner - Coolant Confusion
by tony1679. 09/25/18 05:16 AM
European Formula: Supertech and Mobil 1
by Snagglefoot. 09/25/18 02:19 AM
KFE brake pads?
by deoxy4. 09/25/18 01:16 AM
GM Marine Engine wont start
by Gito. 09/24/18 11:59 PM
New TV bad picture some channels part2
by raaizin. 09/24/18 10:46 PM
Another Bad PCM on a Buick 3.8L!
by clinebarger. 09/24/18 10:17 PM
Funny pictures thread
by JLTD. 09/24/18 08:40 PM
Redline 15w40: Low or Mid Saps?
by SavagePatch. 09/24/18 06:59 PM
What are these cables to?
by 99Eclipse. 09/24/18 06:44 PM
Help with parasitic draw?
by buck91. 09/24/18 05:57 PM
Costco Car Buying Program
by dkryan. 09/24/18 05:39 PM
Glass Scrub?
by buck91. 09/24/18 05:03 PM
Loosing coolant from somewhere
by NICAT. 09/24/18 03:47 PM
2010 or so Ford Fusion Sport thoughts?
by ZZman. 09/24/18 03:35 PM
Newest Members
fortim, albert001, LG_Electronics, TCam, OzFrog
66063 Registered Users
Who's Online Now
82 registered members (Bbonez, bernau, Astro14, advocate, Armkb, Anthony, 7 invisible), 1,332 guests, and 32 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,975
Posts4,853,597
Members66,063
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Page 1 of 3 1 2 3
Oil recomendation - Jeep Grand Cherokee 4.0L #4504948
09/01/17 10:28 PM
09/01/17 10:28 PM
Joined: Aug 2017
Posts: 7
California
RJCannon Offline OP
RJCannon  Offline OP
Joined: Aug 2017
Posts: 7
California
1. What kind of vehicle you have

1997 Grand Cherokee 4.0L I-6


2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well

I don't have a owners manual. I know that Jeep calls for a 10w-30 oil



3. Where you live

High desert, SoCal. 2500 ft level. 114f summers to 20f winters at the extremes.



4. How you drive (easy? hard? fast? slow?)

Drive easy, floored to get on freeway, Italian tuneup day before oil changes. Off road easy, trail runs, mild rock crawling a few times a year.




5. What your daily drive is like (short trips? long trips? city? highway?)

Commute twice weekly from 2500 ft level to 4200 ft level then down to 800ft level and then back. Otherwise it's mild city driving the rest of the week.




6. Whether your car has any known problems

No know problems. Doesn't burn a lick of oil during a regular 3000 mile Oil change interval.





If you have any preferences -- synthetic vs. conventional, store-bought vs. ordered online, how long you'd like to go between oil changes, etc. -- or any other info you think might be important, let us know that as well.



No preference, other than what will help to get me past the 300,000 mile mark.

Here's the deal. I bought my 1997 Jeep Grand Cherokee with 197,000 miles on it. I now have 214,000 miles on it.
Previous owner was anal about regular maintenance, oil changes regularly. I have done the same. Oil changes between 3000-5000 mile.
I bought into the "use a heavier oil, Jeep 4.0L engines like it" and used a generic 15w-40 from my past job(major forklift manufacturer branded oil). for first two changes. Then switched to Rotella 15w-40 for the last few changes, due to the "you need zinc in Jeeps" ideas out there.
The last oil change I switched up, went with Pennzoil Yellow Bottle dino oil in a 5W-20 weight. Here's why.
I read a paper about using the lowest viscosity oil that still maintains proper oil pressures. Engines run up to a regular temperature, regardless of outside temp. My engine runs right between 200-210F, regardless of outside temps. The lower initial viscosity will help to get the oil flowing quicker and reduce that "startup wear" that is supposed to be the bigger killer. My engine has always been 20-30PSI at idle up to about 1500 rpm, then 40+ PSI after any RPM above 1500RPM. So I was good for pressure.
As a forklift tech, I understood that the flow is most important, to a point, over pressure. Maintain pressure and flow, your golden. But then further reading, oil shear under loads, Jeep cams grinding themselves up, needing zinc, others say once broken in your golden and on. Now my head is spinning.
One last note, I don't tow or drive heavily loaded. I do understand that if I did so, I'd want the heavier oil to handle the increase loads, temp and others, when doing so.

So, with all that, what do you think? Is it hype about needing zinc for the entire life of a Jeep 4.0L engine? Am I good with a 5w-20? Should I move to a 5w-30, go to factory recommended 10w-30?

Again goal is, 300,000+life on this engine.

Oh, one last note, the "diesel" tick the engine has had while using 15w-40 went away when I switched to 5w-20, I liked that. It has slightly returned now that I'm at the 3000 mile mark on this load of 5w-20. Normal?

Thanks for your time and answers, I'll make sure to stop in to answer any questions posed.

Other than that, I hate this site. It has sucked me in and I have lost DAYS reading through the boards. Still left with my head spinning! LOL.

Last edited by RJCannon; 09/01/17 10:34 PM.
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504952
09/01/17 10:35 PM
09/01/17 10:35 PM
Joined: Jun 2017
Posts: 553
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 553
DFW
In my old ZJ 4.0, I ran PYB 5W-30 which it seemed to love. I ran a synthetic once, but it drasticappy increased the leak I had at the oil filter adapter. Switched back to PYB and it slowed way back down.

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504956
09/01/17 10:44 PM
09/01/17 10:44 PM
Joined: Jun 2003
Posts: 17,371
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,371
Deplorable in apple valley, ca
Hey neighbor! They are not picky at all. 10w30,10w40 and 15w40 all work well in them. Mine likes 10w30.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504963
09/01/17 10:56 PM
09/01/17 10:56 PM
Joined: Jul 2013
Posts: 117
NC
lawrencerd Offline
lawrencerd  Offline
Joined: Jul 2013
Posts: 117
NC
PYB 10W30 has worked well in my 01. Magnatec, Maxlife, and MS5K have run totally fine as well. I've treated it to PP 10w30 once and it did feel nice, but it's probably overkill for it.

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504970
09/01/17 11:04 PM
09/01/17 11:04 PM
Joined: Aug 2017
Posts: 7
California
RJCannon Offline OP
RJCannon  Offline OP
Joined: Aug 2017
Posts: 7
California
Howdy neighbor! How you liking this heat and humidity! I was in Ontario yesterday, 115F there, WOW!

Anyways, neither of you are concerned with the zinc/cam details and the removal of zinc?

Fixed my oil filter adapter leak right after buying it. Right now I have a small leak on the left side of the oil pan gasket seam. I'll fix that next oil change, drop the pan and have a looky inside. Have had the valve cover off, clean as a whistle. Oil on dipstick is still semi clear, even so close to 3000miles on this oil. Swapped in a 99+ intake, intake runners were spotless! I've always ran Costco gas with Techron every oil change. So far extremely happy with this Jeep. I want to make it last.

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504978
09/01/17 11:31 PM
09/01/17 11:31 PM
Joined: Jun 2003
Posts: 17,371
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,371
Deplorable in apple valley, ca
Originally Posted By: RJCannon
Howdy neighbor! How you liking this heat and humidity! I was in Ontario yesterday, 115F there, WOW!

Anyways, neither of you are concerned with the zinc/cam details and the removal of zinc?

Fixed my oil filter adapter leak right after buying it. Right now I have a small leak on the left side of the oil pan gasket seam. I'll fix that next oil change, drop the pan and have a looky inside. Have had the valve cover off, clean as a whistle. Oil on dipstick is still semi clear, even so close to 3000miles on this oil. Swapped in a 99+ intake, intake runners were spotless! I've always ran Costco gas with Techron every oil change. So far extremely happy with this Jeep. I want to make it last.
check the oil pan bolts nearest the exhaust pipes. Those seem to loosen up and tightning them often works.

Last edited by Chris142; 09/01/17 11:32 PM.

02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4504986
09/02/17 12:11 AM
09/02/17 12:11 AM
Joined: Feb 2013
Posts: 10,717
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,717
Phoenix, AZ
The Jeep 4.0L is a popular oil post on here.

Use a 10w30. Doesn't really matter what brand, they aren't picky as far as brand. The 4.0L is known to shear oil down a grade, which you don't want to do, don't run a 5w20. Oil isn't going to get anywhere any faster from one grade to the next unless you're at -20 degrees.

Here's a list of oils I've run in my Jeep:
Dealer bulk
Castrol GTX HM
Valvoline Maxlife
Chevron Supreme HM
Pennzoil Platinum
Mobil 1 HM
Napa Conventional

It runs the same on all of them. Pick a 10w30 and go for it. I'd do 3-4,000 on conventional and 5-6,000 on synthetic. And yes you can switch from conventional to synthetic and back as much as you'd like.


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4505002
09/02/17 01:08 AM
09/02/17 01:08 AM
Joined: Aug 2017
Posts: 211
Cincinnati, USA
Dave9 Offline
Dave9  Offline
Joined: Aug 2017
Posts: 211
Cincinnati, USA
Formatting, I didn't read that.

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: Dave9] #4505006
09/02/17 01:35 AM
09/02/17 01:35 AM
Joined: Aug 2017
Posts: 7
California
RJCannon Offline OP
RJCannon  Offline OP
Joined: Aug 2017
Posts: 7
California
Originally Posted By: Dave9
Formatting, I didn't read that.


Hey, thanks for the helpful input!

Now where's that thumbs up/smilie thingy?

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: Chris142] #4505008
09/02/17 01:37 AM
09/02/17 01:37 AM
Joined: Aug 2017
Posts: 7
California
RJCannon Offline OP
RJCannon  Offline OP
Joined: Aug 2017
Posts: 7
California
Originally Posted By: Chris142
check the oil pan bolts nearest the exhaust pipes. Those seem to loosen up and tightning them often works.


The simple things. I didn't even think to check 'em when I've been under there. Gonna do it tomorrow.

Thanks!!

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: Nick1994] #4505009
09/02/17 01:41 AM
09/02/17 01:41 AM
Joined: Aug 2017
Posts: 7
California
RJCannon Offline OP
RJCannon  Offline OP
Joined: Aug 2017
Posts: 7
California
Originally Posted By: Nick1994
The Jeep 4.0L is a popular oil post on here.

Use a 10w30. Doesn't really matter what brand, they aren't picky as far as brand. The 4.0L is known to shear oil down a grade, which you don't want to do, don't run a 5w20. Oil isn't going to get anywhere any faster from one grade to the next unless you're at -20 degrees.

Here's a list of oils I've run in my Jeep:
Dealer bulk
Castrol GTX HM
Valvoline Maxlife
Chevron Supreme HM
Pennzoil Platinum
Mobil 1 HM
Napa Conventional

It runs the same on all of them. Pick a 10w30 and go for it. I'd do 3-4,000 on conventional and 5-6,000 on synthetic. And yes you can switch from conventional to synthetic and back as much as you'd like.


Yeah, I was figuring going back to the 10w-30.

No issues with cams with less zinc? Should I just stop over thinking and just go with the flow huh?

Like I said above, looking for 300k+ miles...

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4505039
09/02/17 04:25 AM
09/02/17 04:25 AM
Joined: Feb 2008
Posts: 1,102
PA
umungus1122 Offline
umungus1122  Offline
Joined: Feb 2008
Posts: 1,102
PA
The valve springs aren't that strong, so no big need for high zinc as in high strength spring set-ups.


'95 Chevy 1/2t 305 205k -NexGen Maxlife 5w-30, Wix filter
'89 Jeep Comanche 4.0 278k - GC 0w-30, Bosch LongLife filter
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4505047
09/02/17 04:48 AM
09/02/17 04:48 AM
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
You could easily run 5k changes. I would stay with the 15-40 or a 10-30. If you can find a 10-30 that is not labeled resource conserving it will be on the thicker end. I'd recommend M1 HM 10W-30 because it's almost a 40 but it's way overkill for 3k


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30
Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4505071
09/02/17 05:47 AM
09/02/17 05:47 AM
Joined: Sep 2013
Posts: 10,462
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,462
Indiana
My Jeep's mileage is just under yours. Noise wise, I think it prefers something xxw40 now as it's pretty clackity (your diesel ticking) on anything else. I ran 10w30 and 5w40 for the longest time before this issue and noise free for the most part.

Now I am running Castrol Edge HM 10w40. It's a slight overkill for this engine, but it seems to run just as quiet on this as it does with PYB.

I would not run 5w20 in an engine requiring a 10w30. Mine seems to be picky with oil filters so that may be a cause for the ticking you're experiencing too.


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Oil recomendation - Jeep Grand Cherokee 4.0L [Re: RJCannon] #4505092
09/02/17 06:47 AM
09/02/17 06:47 AM
Joined: Mar 2004
Posts: 20,758
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,758
Upstate NY
Run a quality 10W30 oil. Synthetic if you have the extra $$.

Don't over think it. The engine is not that picky.

Be more concerned with #331 head cracking or piston skirt cracking and falling off.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Page 1 of 3 1 2 3

BOB IS THE OIL GUY® Powered by UBB.threads™