Jeep Advice

[ARMY_Guy]

Happy Spring BITOG'ers. I have some questions for you, please feel free to respond. the signature specs. are updated.

BackGround) I've run 6 qts. of Mobil 1 Turbo Diesel Truck 5w40 for over 3,000 miles in my beloved Jeep Wrangler with its 4.oL I6. The reason I ran the (Mobil 1 Turbo Diesel Truck) is because I was experiencing mad valve tick in the fall/winter here in New Jersey, and friends here on BITOG recommended it as a good synth. oil with tremendous cleaning additives. The valve tick has indeed cleared up, but lately, every now and then, I've been getting a hint of it again.

Question 1) With 3,ooo miles having been driven on January's 6 qts. of M1, 5-40 (Mobil 1 Turbo Diesel Truck), is it time for me to replace the engine oil with another run of (Mobil 1 Turbo Diesel Truck)?

Question 2) Will it suffice if I change the filter and add a top off qt. with the same oil?

Question 3) If the above is recommended, which filter do you recommended of the few I have now: a Wix, Fram, Stp, Mopar, or K&N?

Question 4) If I'm to change just the filter and top it off with 1 qt. of (Mobil 1 Turbo Diesel Truck), how many total miles should I leave it in there for before I do a fresh fill?

Question 5) Whats TBN?

Predisclaimer) Yes I know I dont have to type (Mobil 1 Turbo Diesel Truck) for Mobil 1 Turbo Diesel Truck 5w40; but it looks sooo cool.

Disclaimer) Some of you here must roll your eyes everytime you see me post, thats why I took 2 months off earlier; but heres the deal. You know as well as I do about how bad it is out there, and friends from the looks of everything I see on Bloomberg, and Fox, etc., its not getting better anytime soon (before 2010). I love Jeep. I didn't say I love 'my' Jeep mind you, I adore my Jeep, and also love the company it was manufactured by. To me it's as American as you can get. (Daimler Chrysler aside...) I want to keep my vehicle for a very very long time, God-willing, and will do whatever I can (legally) to make that happen. So you can see why its so important to me to do things right, and get input by you aficionados, experts, fans, freaks, and friends at BITOG.

I do want to say I'm sorry if you tire of me or my questions, and thank you for your time.

God Bless America.

-A

 

[Johnny]

I would wait until at least 5,000 miles before changing and that oil is fine. Shell Rotella T synthetic 5W-40 is another good one to use. I would use either the WIX or Mopar filter.

TBN = Total Base Number. It's the ability of the oil to fight the acids that build up in your crankcase that are produced by the combustion process and water. Usually you see higher TBN numbers with higher amounts of calcium. But the most important thing is TBN retention.

 

[Greaser]

Do 5000 mile oil changes with a quality HDEO like Rotella or Delvac 1 and use a quality filter like Wix,Napa Gold etc. and the Jeep will turn to dust before the engine wears out.

 

[bigjohn]

Our Jeep is the same way.....Thicker oil has been better.

Honestly, we notice more engine noise after about 2 months or 1,500 miles. These 4.0L Inline 6's must be really, really tough on oil.

Our next change, we will go to Rotella Synthetic 5w40.

A little weird, but you might want to try Premium Fuel. Some of our noise is piston slap and Premium Fuel takes it right away.

 

[Zaedock]

Originally Posted By: ARMY_Guy
I do want to say I'm sorry if you tire of me or my questions, and thank you for your time.


There is no bad Jeep question!

I'd run that oil to 5K easy! I think your lifter tick is a good excuse to do an AutoRx run. Pick up some dino (QS green bottle is $10.5 @ Walmart) and run it per instructions. I'm sure it will help! Typically, 2.5L/4.0L engines seem to like a 40wt, but I think a 10W30 is fine if you're not beating on it.

I own two 4.0L's, a 2.5L, and a F-134 in my Willys. My oil of choice in summer is any 10w40 conventional or Delo SAE30 (I have gallons of it!). I use 5W30 in my 2.5L '92 Wrangler trail rig and my 4.0L '89 Cherokee in winter. The other 4.0L is a 2000 Wrangler based buggy. As far as filters go, I run Motorcraft FL300 and Purolator Premium Plus.

I think your Jeep would run forever with 5K mile changes with dino and Motorcraft or equivalent filters. If you run syn, I'd bet you could go to 7-7500K changes.

I'm going to agree on trying the premium fuel. I had a buddy store his '87 Wrangler at my house for a couple years. I'd start it/drive it once in a while. One day, it had a knock. Out of the blue. I couldn't figure out what the [censored] was wrong. When it came time for some fuel, all I had left was hi-test gas I use in my modified ATV. After dumping that in, I started the Jeep and sure enough, the knock slowly disappeared and to this day (my buddy has it again) does not make ANY noise. Change stations or maybe do a tank of 89 or 92 and see if it helps!

 

[Gary Allan]

Quote:
Question 1) With 3,ooo miles having been driven on January's 6 qts. of M1, 5-40 (Mobil 1 Turbo Diesel Truck), is it time for me to replace the engine oil with another run of (Mobil 1 Turbo Diesel Truck)?


No. Mobil 1 Turbo Diesel Truck should be good for over 1 year. Even in lower mileage usage. Even RTS held up well in my 2.5 for back to back 13m/9.5k runs. The metals weren't great, but the oil was just fine.

Quote:
Question 2) Will it suffice if I change the filter and add a top off qt. with the same oil?


Not necessary, imo.

Quote:
Question 4) If I'm to change just the filter and top it off with 1 qt. of (Mobil 1 Turbo Diesel Truck), how many total miles should I leave it in there for before I do a fresh fill?


One year total. I've only ever seen ONE UOA where this oil has been beat up. You would really have to be in some odd doo-doo mechanical condition (fuel- ect) to have this require this frequent level of service.

Settle on 6 months regardless of mileage with something cheaper like RTS. If you're 10k and above, leave the filter on and make it a top tier filter. If it's too far below 10k ..then swap it out every time.

 

[lawdogg]

Great info. I have a similar engine (4.0L) in my 2002 WJ, and I have historically ran Mobil 1 10w30 but have recently switched to Rotella-T 10w30 with no real results yet. Always an Mobil 1 filter.

 

[afoulk]

I had a 05 Rubicon with the 4.0 and it was by far the noisiest vehicle I ever owned. If it wasn't the extremely loud injectors, it was the abnoxious piston slap, even when hot. I had it in numurous times for the piston slap and other odds and ends, and chrysler always refused to do anything about it. I wound up going after the lemon law and settled out of court. I probably could have ran the thing past 200,000miles and never had a problem, but I wasn't taking a chance. Way I saw it, I payed a lot of money for a brand new product, and it wasn't performing the way it should have. Now I have a 2008 wrangler that runs great, other than the occasional lifter tick when I get close to the end of my OCI, and I've noticed it starting to ping on the warmer days here lately, usually when my coolant temp gets above 200*. I hoping its just winterized gas yet thats causing it. Anyways, my point is, that will probably run forever, irregaurdless of what oil you use or what noises it makes. I'd just stick with the Mobil 1 Turbo Diesel Truck or use the Rotella syn.

 

[mcrn]

Originally Posted By: BigJohn
Our Jeep is the same way.....Thicker oil has been better.

Honestly, we notice more engine noise after about 2 months or 1,500 miles. These 4.0L Inline 6's must be really, really tough on oil.

Our next change, we will go to Rotella Synthetic 5w40.

A little weird, but you might want to try Premium Fuel. Some of our noise is piston slap and Premium Fuel takes it right away.


I do not see how premium fuel can help with piston slap? I do see it helping with pinging obviously but piston slap? If this was true GM should have just said to use nothing but premium to help with their piston slap.

 

[Gary Allan]

I've never known the 4.0/2.5 to suffer from it. He may be experiencing CCDI (combustion chamber deposit interference) ..which would also explain the knocking when hot.

Quote:
Combustion chamber deposit interference (CCDI) and combustion chamber deposit flaking (CCDF) are two other problems which sometimes occur in certain modern engine designs. CCDI is the result of physical contact between deposits on the piston top and cylinder head and is manifested as a loud, metallic banging sound when the engine is cold.


You can trust your car to the man who wears the star

 

[MarkC]

My 96 Cherokee 4.0 has always had 10W30, either Castrol, Havoline, or Chevron, and still runs like new at only 150K. I think I used Delo 5W40 mixed with Chevron 10W30 once by mistake. I've never noticed a difference in engine noise or performance. Pretty quiet for a 4.0 too.

Since I just bought a new Jeep, I'm trying to decide how to handle oil change intervals and maybe even type of oil on the Cherokee, since it's going to get significantly fewer miles put on it.

 

[mstrjon32]

My Cherokee just turned over to 175K yesterday. It's a bit noisy and lately has sounded rougher in 5th gear when screaming down the highway at 80-85, but I suspect that I'll be fighting rust more than I'll be fighting mechanical failure as the miles continue to roll by.

 

[gomes512]

Those motors will run forever, heck you can probably run high heat cooking oil in em for 3k. Any hd motor oil you use for a minimum 5K oci's will get you well past 200K. Don't mind the ticking, I've seen two motors with ticking from new to 250K and 270K before being sold.

 

[UNC017]

4.0s don't make more noise than newer engines... its just that newer engines have more sound deadening (pastic/metal/plastic laminate valve covers and oil pans for example) so the driver doesn't hear as many of the noises other engines are making

4.0s will outlive most peoples' willingness to keep driving the same vehicle.

 

[ARMY_Guy]

Thanks for your input everyone.

-F

 

[Greg L]

I have always run Valvoline conventional in my Jeep 4.0, until about 3 years ago when I decided to try PP. I now have Havoline Synthetic in there (which had some valve tick noise at first) but is now fine.

The quietest and best gas milage so far was on the PP. I just turned over to 150k myself. This thing just never seems to die.


GL