UOA for Jeep 4.0

[dlundblad]

Long time lurker that finally made an account.

Just curious if anyone has sent away for a UOA for a Jeep 4.0 that specifically used M1 TDT or R T6. I've been thinking about doing one myself, but I figured I'll check here first. I've been using M1 TDT for about 50,000 and seems very clean, but like most 4.0s mine is noisy with a lifter tick. I've read that T6 will actually quiet that down. Sooo basically I'm asking which one is better based on numbers and facts.

M1 is very specific about their oil stats such as amounts of zinc and phosphorus. Rotella not so much.. That's where a UOA would be handy.. Run the oil for 4000 mile OCIs check the zinc, phosphorous and iron ppms.

I'm not too concerned with saving money on oil. I can get T6 for $1 cheaper than M1 per gallon so that's not the issue. I just want what's best for my Jeep.

*** I've also read people use M Delvac 15w 40. I'd consider it but I'm trying to stay with synthetics if I can.

Thanks.

 

[440Magnum]

I've done a couple of Rotella UOAS on a 4.0, plus a filter dissection, actually. I think these are pre "RT6" branding:

https://bobistheoilguy.com/forums/threads/1999-jeep-4-0-rotella-t-syn-5w40-4900-miles.105872/

https://bobistheoilguy.com/forums/threads/rts-sm-cj-5w40-jeep-4-0-5726-miles.122906/

https://bobistheoilguy.com/forums/threads/p1-pl3001-2001-jeep-cherokee-6k-miles-rt6.144935/


I've used M1 TDT in the 99, but never did a UOA on it. Of the two I prefer RT6 because of price, availability, and the TDT seemed to weep out the notoriously weepy rear main seal on the 4.0 worse than RT6. On the whole I tend toward M1 products a little more than SOPUS, but RT6 for the Jeeps is a clear exception for me. The wear numbers with T6 are always stellar, so there's really no reason to look further for a 4.0 lubricant, IMO.

As for Delvac, I've noticed that Delvac 1 synthetic 5w40 is becoming just about as easy to find as RT6 lately- sometimes easier to find than TDT! I've always thought TDT was a bit of a redundant product and existed mostly to market an oil to the "new to diesel ownership" crowd that's always bought M1 but then goes out and buys a Powerstroke, Cummins Ram, or Duramax for the first time.

 

[dlundblad]

You hit the nail on the head. Oil geekery is addicting!

You've inspired me to get a UOA done for mine. I didn't realized the reports were so detailed.

 

[racer12306]

This is our old 02 with Rotella 5w40

http://www.bobistheoilguy.com/forums/ubb...rue#Post1100419

 

[Donald]

Originally Posted By: dlundblad
Long time lurker that finally made an account.

Just curious if anyone has sent away for a UOA for a Jeep 4.0 that specifically used M1 TDT or R T6. I've been thinking about doing one myself, but I figured I'll check here first. I've been using M1 TDT for about 50,000 and seems very clean, but like most 4.0s mine is noisy with a lifter tick. I've read that T6 will actually quiet that down. Sooo basically I'm asking which one is better based on numbers and facts.

M1 is very specific about their oil stats such as amounts of zinc and phosphorus. Rotella not so much.. That's where a UOA would be handy.. Run the oil for 4000 mile OCIs check the zinc, phosphorous and iron ppms.

I'm not too concerned with saving money on oil. I can get T6 for $1 cheaper than M1 per gallon so that's not the issue. I just want what's best for my Jeep.

*** I've also read people use M Delvac 15w 40. I'd consider it but I'm trying to stay with synthetics if I can.

Thanks.


I will be doing on using T6 in the next month or so.

 

[KCJeep]

I've never seen a 4.0 UOA with Rotella that wasn't fantastic. I've also never seen one posted at all with the two lubes you mentioned. Be a trail blazer and get us one!

 

[440Magnum]

Originally Posted By: KCJeep
I've never seen a 4.0 UOA with Rotella that wasn't fantastic. I've also never seen one posted at all with the two lubes you mentioned. Be a trail blazer and get us one!

Yeah, I had the opportunity and missed it because I've used both in the 99 4.0 But a) at only 1 interval the TDT test would have been of limited value, and b) I knew I wasn't likely to use TDT again. So I didn't go to the trouble of collecting a sample and sending it in.

 

[dlundblad]

I plan to. Haha.

As of now I'm using M1 HM 5w30. Long story. Basically I needed an oil change and that's all that was available.

In order to perform an accurate UOA, should I run TDT one interval, then perform the test on the following run of TDT? As with the T6. Just to clean out other remaining oils to give them a fair trial.

 

[jstutz]

check out this link. Some one has gathered many different UOAs on Jeep 4.0 and compared them 30w vs 40W. You may find it interesting.

http://www.jeepstrokers.com/forum/viewtopic.php?f=15&t=330#p3636

 

[KCJeep]

Originally Posted By: dlundblad
I plan to. Haha.

As of now I'm using M1 HM 5w30. Long story. Basically I needed an oil change and that's all that was available.

In order to perform an accurate UOA, should I run TDT one interval, then perform the test on the following run of TDT? As with the T6. Just to clean out other remaining oils to give them a fair trial.


That is the best way to do it although we see plenty on here that are single runs and they are still of some use.

 

[gomes512]

Originally Posted By: jstutz
check out this link. Some one has gathered many different UOAs on Jeep 4.0 and compared them 30w vs 40W. You may find it interesting.

http://www.jeepstrokers.com/forum/viewtopic.php?f=15&t=330#p3636



Was about to link to the same article.

I'd say the Mobil 5w30 HM you have in there right now is a great pick for the 4.0. As for quieting tick, besides rendering it less annoying, does that actually do anything for the motor? My '94 developed a tick in '97 at about 35K. Still truckin' at 200K today, tick and all. I've been mainly using 5w30's that go on sale at the local store.

If your neck of the woods, in Indiana, gets any appreciable winter then there's another reason to stick with a 30.

 

[dlundblad]

Originally Posted By: jstutz
check out this link. Some one has gathered many different UOAs on Jeep 4.0 and compared them 30w vs 40W. You may find it interesting.

http://www.jeepstrokers.com/forum/viewtopic.php?f=15&t=330#p3636



This basically proves running heavy oils doesn't make a notable difference. Hmmmmmm. I like the idea of a synthetic oil with "extra" zinc and phosphorous. Maybe M1 HM is just fine then. Although M1's site states the HM is for engines with high miles making the switch from convention to synthetic. I took it to mean it was used as more of a prepping solution rather than one that could always be used.

" I thought Mobil 1, as a full synthetic, already provided the protection my high-mileage car needs. Do I really need to switch off Mobil 1 to your High Mileage product for my high-mileage car?

Mobil 1 High Mileage is designed for high-mileage vehicles that have been using conventional motor oils. It's true that most Mobil 1 vehicles with 75,000 plus miles should be in excellent condition and would not require some of the Mobil 1 High Mileage benefits. However, most cars on the road today do not use synthetic oils, so we developed this oil specifically for these cars that would benefit from switching off conventional oil."


As stated in the Jeep strokers link, you wont destroy your engine if you run a heavy duty oil, but what is the point if there is no reason? Personal preference is suppose..