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#3221023 - 12/18/13 08:21 PM 2001 Jeep GC 4.0 with T6 Rotella T6
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY
I am not sure what to say or think. The reman engine is way past breakin. I almost never do short trips, usually 30-40 minutes. I have used the remote starter a few (very cold) times, but then drive it the 30-40 minutes. The T6 seems to have done better than PU for the most part. Not sure whats up with the fuel dilution.



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#3221043 - 12/18/13 08:39 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
steve20 Offline


Registered: 06/19/07
Posts: 3475
Loc: Morris County NJ
Hey Donald--add some MMO, you'll sleep better
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#3221058 - 12/18/13 08:51 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
simple_gifts Offline


Registered: 07/26/04
Posts: 11602
Loc: Middlesex County CT
lol.

There is an oil cap on the engine, not a solvent cap.


Edited by simple_gifts (12/18/13 08:52 PM)
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#3221095 - 12/18/13 09:33 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
brandini Offline


Registered: 10/08/09
Posts: 1154
Loc: Richmond, VA
leaky injector?
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#3221096 - 12/18/13 09:35 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
Chris142 Online   content


Registered: 06/05/03
Posts: 15819
Loc: apple valley, ca
I'm havine trouble reading the report but from what I can see.Something is coming apart! It's made of metal, I think it's gotten into your bearings from the lead and copper in the report. The 4.0 throws some iron but not tripple didgits, maybe 20-30ppm at the most.

Your airfilter or it's tubing isnt sealed well either but that just a small issue for now. Is this engine still under warranty of any kind?
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#3221107 - 12/18/13 09:47 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY
Read the bottom set of numbers, its the most recent with T6 oil. Its past warranty. I have checked the air intake system several times and do not see any problems. The air filter is relatively new, the breather hose and elbow have been replaced along with the PCV, grommet and hose.

The copper is a little high, but not the lead. I would expect both high if a bearing. No oil cooler in this vehicle. So where is the copper coming from? I read some place it can come via a fuel line, but that seems a stretch.

Any chance the Fumoto oil change valve is where the copper is coming from? Its brass.

I was considering replacing the injectors anyway.

I do not consider the TBN low at all.


Edited by Donald (12/18/13 10:00 PM)
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#3221134 - 12/18/13 10:13 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
KCJeep Offline


Registered: 06/30/11
Posts: 6858
Loc: Mahzurrah!
Thats the best run you've had. I can't read the iron, 36? The aluminum is fantastic though at 1 ppm always a concern in these.

The copper is odd. At this point you've used an oil well known to produce stellar UOA's in the 4.0 so I don't think you're going to do any better oil wise at this point. Your reman just seems to have a rather unique base line I guess.
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#3221174 - 12/18/13 11:55 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Chris142]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: Chris142
I'm havine trouble reading the report but from what I can see.Something is coming apart! It's made of metal, I think it's gotten into your bearings from the lead and copper in the report. The 4.0 throws some iron but not tripple didgits, maybe 20-30ppm at the most.

Your airfilter or it's tubing isnt sealed well either but that just a small issue for now. Is this engine still under warranty of any kind?


From what I can see, I think sample #1 is the triple digits for Iron, and it has come down nicely since then. My 4.0 throws around 21 ppm Iron in 5000 miles so it's breaking in nicely, as far as Iron is concerned.

Fuel dilution, on the other hand....what head do you have on the engine? Was it reused in the rebuild and is it an 0331 casting?
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#3221232 - 12/19/13 03:07 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
901Memphis Offline


Registered: 08/14/10
Posts: 12703
Loc: Northern Kentucky
Can't barely make anything out, can you try uploading at a different resolution?
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#3221275 - 12/19/13 06:43 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Kuato]
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY
Originally Posted By: Kuato
Originally Posted By: Chris142
I'm havine trouble reading the report but from what I can see.Something is coming apart! It's made of metal, I think it's gotten into your bearings from the lead and copper in the report. The 4.0 throws some iron but not tripple didgits, maybe 20-30ppm at the most.

Your airfilter or it's tubing isnt sealed well either but that just a small issue for now. Is this engine still under warranty of any kind?


From what I can see, I think sample #1 is the triple digits for Iron, and it has come down nicely since then. My 4.0 throws around 21 ppm Iron in 5000 miles so it's breaking in nicely, as far as Iron is concerned.

Fuel dilution, on the other hand....what head do you have on the engine? Was it reused in the rebuild and is it an 0331 casting?



The engine was a complete reman from Marshall Engines just needing tin. The head is whatever they used.
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#3221313 - 12/19/13 07:20 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY


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#3221324 - 12/19/13 07:31 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
badtlc Offline


Registered: 06/08/06
Posts: 5108
Loc: KC
The rotella run looks fine other than your cold starts are brutal. You might throw in an italian tuneup every few thousand miles to really burn that gas out of the oil or stop with the cold start idling.
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#3221350 - 12/19/13 08:04 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: badtlc]
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY
Originally Posted By: badtlc
The rotella run looks fine other than your cold starts are brutal. You might throw in an italian tuneup every few thousand miles to really burn that gas out of the oil or stop with the cold start idling.


So lets say I remote start my Jeep and let it run 5 minutes, then drive at 40 to 60 MPH for 30 minutes. Won't it have "burned" off any fuel that was in the oil?


Edited by Donald (12/19/13 08:04 AM)
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#3221434 - 12/19/13 09:24 AM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
brandini Offline


Registered: 10/08/09
Posts: 1154
Loc: Richmond, VA
Should have, unless your thermostat is keeping things too cool.

But an italian tune up's purpose is to get things hot, not warm, so higher load, acceleration runs, up a mountain etc are what you want.

Or drop a gear/hold a lower gear a bit more when you can and let it purr a bit more.
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#3221691 - 12/19/13 01:45 PM Re: 2001 Jeep GC 4.0 with T6 Rotella T6 [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 19508
Loc: Upstate NY
Looking back for other Jeep 4.0 engines I found one UOA with 2 @ 3500 and another one with 6 @ 3500 miles. So mine is 16 at 5000 so significantly higher.
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