4.0L I6 Jeep

[KCJeep]

Originally Posted By: 84zmyfavorite
Its my belief that Good condition, Tight clearance 4.0s do run better with a 10w-30, or even a 5w-30 in cooler temps. Ive had a handfull of these 4.0s in my time, two of which I still have now, one of which is my 99 with its Freshly Built 4.0 that Im driving today, the other being my Beloved 2001 SilverStone Metallic Jeep Cherokee with its 64,606 mile 4.0. Neither of these Good, Tight engines "Mind" thicker oil(Custom Break-In Oil for the 99 was somewhere in the low Straight 30s), and I have put 15w-40 Diesel oil in my 01, with Good results actually. My 01 has Quaker State 10w-40 in it right now. I do believe that High Mileage, Severe useage 4.0s DO like heavier weight oils like Straight 30s, Diesel 15w-40s, and even 20w-50 weight oils to "Fill" in the gaps between Worn moving parts. Those Newer, Tight tolerance engines discussed before might make noise with thicker oils because they are not getting suffecient oil to their Tight Tolerance moving parts. Thats my humble opinion, Im only right about half the time anyways. I use 10w-30 or 10w-40 in Good Jeeps with 4.0s, and Straight 30 usually in Worn Jeeps.


Good post and I certainly agree with you after my recent experience. I've always used 10w30's with great results but tried the 15w40 and developed a definite knock. Since I'd gone thicker and nothing else I also surmised the oil was too thick and indeed a quart of MMO thinned it enough to make it stop and I'll still run it to the next OCI. Mine's an 04 with 86k so likely still pretty tight for the good old I-6.

 

[wsar10]

Well said,
this has kinda been my thinking aswell, no proof to post really but just kind of seemed like a common sense "thought".

You hear of guys runing it (15/40) in there early 90's 4.0 just for the sake of there oil pressure running higher while using it, I have only used 10-30 HDEO with my current 4.0, I would run a 5-30 T5 in the winter if they made it.

Originally Posted By: 84zmyfavorite
Its my belief that Good condition, Tight clearance 4.0s do run better with a 10w-30, or even a 5w-30 in cooler temps. Ive had a handfull of these 4.0s in my time, two of which I still have now, one of which is my 99 with its Freshly Built 4.0 that Im driving today, the other being my Beloved 2001 SilverStone Metallic Jeep Cherokee with its 64,606 mile 4.0. Neither of these Good, Tight engines "Mind" thicker oil(Custom Break-In Oil for the 99 was somewhere in the low Straight 30s), and I have put 15w-40 Diesel oil in my 01, with Good results actually. My 01 has Quaker State 10w-40 in it right now. I do believe that High Mileage, Severe useage 4.0s DO like heavier weight oils like Straight 30s, Diesel 15w-40s, and even 20w-50 weight oils to "Fill" in the gaps between Worn moving parts. Those Newer, Tight tolerance engines discussed before might make noise with thicker oils because they are not getting suffecient oil to their Tight Tolerance moving parts. Thats my humble opinion, Im only right about half the time anyways. I use 10w-30 or 10w-40 in Good Jeeps with 4.0s, and Straight 30 usually in Worn Jeeps.

 

[Lead Shoes]

They do make a t6 0w30, if you can find it.

 

[MrRPM]

Im kinda thinking about running a 0w-40 for winter
Alot of you recommend a 5w-30 for cold winter use but then alot of you also say 4.0Ls love 40 weights.

well a 0w-40 is going to be very close to oil thickness on cold starts to a 5w-30 because as the operating temp number increases the cold start thickness increases even without a number change. read here: http://www.bobistheoilguy.com/motor-oil-109/

so the way I see it is, in cold climates a 0w-40 is going to run like 5w-30 on cold start ups and a 5w-40 is going to run more like a 10w-30 on cold start ups. But once at operating temp both 40 weights will be thicker then the 30s.

according to the link i posted 40 weight oils have thicker starting viscositys then 30 weights with the same Xw numbers.

anyone else see what Im saying?
so if you want the start up properties of a 5w-30 for winter but want the properties of a 40 weight once at operating temp then a 0w-40 should be a good balance.

 

[wsar10]

no 0-30 T6 here !

We have pretty slim pickings locally, we have 5-40 T6 but based on your link I should just stay with the 10-30 as the 40w will drag the 5 closely to a 10. I like the 30 but would like a 5 winter weight

 

[rslifkin]

I agree that 15W-40 might be a little thick for a 4.0, unless it's pretty worn, and in hot weather only. T6 5W-40 seems to do pretty well, and runs within 1-2 psi of 10W-30 in my mom's 101k mile 4.0. A friend has a 4.0 with 111k on it, and runs M1 5W-30 in it, and sees about the same pressures as my mom's.

Both 4.0s are pretty quiet, although my mom's definitely got a little quieter after switching to T6 (a little less piston slap noise during warmup, valvetrain has always been pretty quiet).

 

[MrRPM]

Originally Posted By: wsar10
no 0-30 T6 here !

We have pretty slim pickings locally, we have 5-40 T6 but based on your link I should just stay with the 10-30 as the 40w will drag the 5 closely to a 10. I like the 30 but would like a 5 winter weight


what 10w-30 are you using?
If its T5 rotella then its a semi-synthetic and the T6 5w-40 should flow better on cold starts because its a full synthetic.

 

[wn1998]

I have 167k on my 4.0L and have used everything from 5w20 to 15w40 and you can't really kill these engines. I currently run 5w30 Maxlife conventional for 5k intervals. There is no need for a synthetic in my opinion unless you are towing or plowing with the jeep.

I did run Mobil 1 Truck and Suv 5w40 for a few OCI's and didn't really notice a difference over conventinal. The only positive is you can stretch out your OCI but I like changing my oil!

 

[wsar10]

Originally Posted By: MrRPM
Originally Posted By: wsar10
no 0-30 T6 here !

We have pretty slim pickings locally, we have 5-40 T6 but based on your link I should just stay with the 10-30 as the 40w will drag the 5 closely to a 10. I like the 30 but would like a 5 winter weight


what 10w-30 are you using?
If its T5 rotella then its a semi-synthetic and the T6 5w-40 should flow better on cold starts because its a full synthetic.

yeah I run T5

 

[MrRPM]

Something interesting I have found is Mobil 1's high mileage 5w-30 (all of their HM weights) has a pretty nice add pack and has almost the same levels of zinc and phosphorus as M1 TDT and rotella t6.

So for a winter time oil a full synthetic 5w-30 high mileage might be another good way to go, 5w-30 is what jeep says to use and HM oils seem to have a little better protection for our jeeps.
just a thought
http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf

 

[wsar10]

Originally Posted By: MrRPM
Something interesting I have found is Mobil 1's high mileage 5w-30 (all of their HM weights) has a pretty nice add pack and has almost the same levels of zinc and phosphorus as M1 TDT and rotella t6.

So for a winter time oil a full synthetic 5w-30 high mileage might be another good way to go, 5w-30 is what jeep says to use and HM oils seem to have a little better protection for our jeeps.
just a thought
http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf




I don't really disagree, but myself personally will not buy mobil oil based solely on principal.
I am not going to be price gouged because of a name !
If they wanna lower the price to the $4-5 a qt that it should be I'll grab some.

 

[Greg L]

Why not stick with another HM, like Rotella High Milage 10w30? I have been using it since this past summer and will be again this fall/winter.

It's cheap enough and seems to have every bit of a good additive pack as Mobil listed above.


Plus, just got back from a long road trip in the Northern Calif mountain high country and off roading....so I plan on doing an oil analysis from Blackstone here shortly with this Rotella HM.


GL

 

[MrRPM]

I was just using Mobil 1 as an example. Also at my meijer Mobil 1 tdt is 21 dollars a gallon and rotella t6 is 22 a gallon..

mobil 1 is fairly priced at wal-mart and meijer stores usually.

 

[wsar10]

I just switched from HM to HDEO a while back.

 

[ARMY_Guy]

Hey Man; welcome aboard. Here are some things I've picked up on BITOG. I have the same application and have the same parameters, 'I love my Jeep & spare no cost'.

*M1 TDT is a great HDEO with awesome cleaning abilities.
*So is Rotella.
*So are all Pennzoil products.
*M1 0-40 is a top shelf oil.
*So is GC in some applications.
*So is PU, and AmsOil.
*Motul is too expensive for our Jeeps, even though its awesome.

My recomendation to you is to do what I do:
*Use M1 TDT in the Summer.
*Use M1 0-40 in the winter.

Jeep wave.
Shout out to Demar Paint, and Happy ThanksGiving to everyone.

-A

 

[84zmyfavorite]

ARMY Guy, that is an AWESOME application of Mobil 1 products in a Jeep that I Highly approve of. Some day I hope to be at that level of Quality maintenance for my Jeeps. I did use Mobil 1 Extended Performance 10w-30 for a couple of OCIs in my Beloved SilverStone Metallic 2001 Cherokee though, which is close, but not quite as good as what youre doing. I hope yours is a 4.0 Inline 6 that youre talking about. No other Jeep motor is as deserving Quality maintenance as a 4.0 in my opinion. AWESOME routine!

 

[MrRPM]

Originally Posted By: ARMY_Guy


My recomendation to you is to do what I do:
*Use M1 TDT in the Summer.
*Use M1 0-40 in the winter.

-A


THIS is exactly what im doing! its cool to see someone else who is already doing what i planned.
my rear main seal is leaking, so im going to fix it soon and re-fill with M1 0w-40. I have TDT in there now.

what kind of OCIs do you do on these oils?

 

[ARMY_Guy]

Aw Man, please tell me you're not being sarcastic, 84Z... Thanks for the vote of confidence though. I cleaned it out with a few OCIs of PYB and MMO, Then TDT for the Summer, A Bardhall (sp?) Flush for 20 minutes - and then, and only then was it ready for this magical elixer everyone's raving about. I'm sure I'll like it. I'm sure the 4.O -yes the 4.O- will like it.

Jeep wave Bro.
-A

 

[ARMY_Guy]

Hey MrRPM, my OCI's are 4,500 - 5,000 miles, then I drain a qt., and put in a Quart of MMO, as a last minute gentle 'bran muffin' for the oil change, if you know what I mean.

Glad this M1 trend is in good use. Heck I even got the Mobil 1 stickers (on a magnet) next on the front quarter panel like a ricer! Yay brand loyality.

I've tried GC, Valvoline, PYB, Kendal (at FireStone) M1 TDT, & M1 AFE - TDT is golden. I'm sure the 0-40's going to be better for the Jersey winter (I hope). My Jeep idles a lot & I drive it everywhere. Hard. High RPM's, highway, city driving, Jack-rabbit-starts, etc. The M1 has worked better than the rest for my particular application (w. Stock rims and Dueller AT's, and that AFE BruteForce Intake, all Superchiped. I either run Sunoco Ultra or regular depending on the FlashPaq setting I choose to use. (Superchips Flashpaq: waste of money)

I believe I've bogarted this space enough.
-A

 

[MrRPM]

yeah, i have heard that Chips for the 4.0 is a waste before too.
I use my jeep is some pretty rough environments. the 2 biggest days was the sand dunes (3 hour drive pulling a trailer, jeep had a hard time staying in torque lock with the AC on. then beat the snot out of it at the sand dunes. had it in 4 Lo floored most the time climbing big hills and things. followed with the drive home.)

http://www.youtube.com/watch?v=i6hNcJLF5JQ
and when I decided to mud bogg the jeep, that was a pretty bad day for the jeep. the clean up took days and its still got dirt in a few hard to reach places.

then we had a storm come threw and a bunch of trees in our front yard had fallen. we used the jeep to pull chunks of tree to the pit where we were taking the fallen trees. the jeep idles for 3 hours other then being used to tow every 5 mins. it went threw half a tank of gas. lol

so because i use it alot i do maintenance religiously and try to use premium products as much as possible or where appropriate.

I have thought about using MMO at the end of oil changes but M1 TDT already cleans pretty good in my experience, i guess ill find out when i pull the oil pan soon. I do run MMO or TC-W3 in my gas though.

JEEP WAVE to you also