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#3393823 - 06/10/14 09:54 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
bigt61 Offline


Registered: 02/12/13
Posts: 1215
Loc: Virginia
A bearing is likely going, no oil will fix it, but a quality synthetic will buy you more time before it becomes catastrophic. Probably some dirt got in during the reman and it's embedded in a bearing and it's just quietly been munching for 60k. If you're gentle, it should start making noise when it gets bad. How many more miles are you trying to go? If it's just a few more years, I'd let it eat. If you need it to last 5 years or longer, I'd have somebody pull the oil pan and find the culprit...or culprits? Slap some bearings, emery the crank, drive it easy into the sunset.
_________________________
92 Suburban 2500 7.4L 57k M1_5w30 4yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 4yr OCI
94 Bonneville 3.8L 152k VML 5w30 2yr OCI
70 Camaro 5.7L 59k

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#3393892 - 06/10/14 11:17 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 13535
Loc: Upstate NY
I remembered that for this entire OCI I added Auto-Rx. The people at Auto-Rx say its possible the Auto-Rx is loosening some hardened oil deposits and that is why the oxidation is high. Its also possible the hardened oil deposits contain wear metals like lead (from break-in) that are coming out with the hardened oil deposits.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#3393899 - 06/10/14 11:23 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: bigt61]
Donald Offline


Registered: 03/21/04
Posts: 13535
Loc: Upstate NY
Originally Posted By: bigt61
A bearing is likely going, no oil will fix it, but a quality synthetic will buy you more time before it becomes catastrophic. Probably some dirt got in during the reman and it's embedded in a bearing and it's just quietly been munching for 60k. If you're gentle, it should start making noise when it gets bad. How many more miles are you trying to go? If it's just a few more years, I'd let it eat. If you need it to last 5 years or longer, I'd have somebody pull the oil pan and find the culprit...or culprits? Slap some bearings, emery the crank, drive it easy into the sunset.


The engine has 60K and the vehicle has 155K. I would like to get 225K on it before I dump it. After that I am not sure the transmission would be reliable.

Wouldn't I have to drop the crankshaft to replace a main? I can only get to the bottom section of the bearing by removing a bearing cap.

The Jeep is in very good shape. CarWell every year. No plowing or off roading. No kids to spill inside. Amsoil fluids in everything but engine.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#3393933 - 06/10/14 11:58 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
Kuato Offline


Registered: 10/23/05
Posts: 3139
Loc: Northeastern MT
Originally Posted By: Donald
I remembered that for this entire OCI I added Auto-Rx. The people at Auto-Rx say its possible the Auto-Rx is loosening some hardened oil deposits and that is why the oxidation is high. Its also possible the hardened oil deposits contain wear metals like lead (from break-in) that are coming out with the hardened oil deposits.


Possibly true, so maybe a couple of OCIs in a row without any treatment. (and thanks for the explanations above)
_________________________
Amsoil


88 Dodge D150, 318 2wd MT 176k
04 Jeep Wrangler 2.4 MT 186k
13 F150 5.0 4x4 24k

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#3393965 - 06/10/14 12:40 PM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
dustyroads Offline


Registered: 05/13/13
Posts: 303
Loc: upstate NY
The iron doubled, too. What happened there? Any relation to whatever is going on with the copper/lead spike?
_________________________
2011 Taurus sel

2012 Volvo big rig with D11

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#3393981 - 06/10/14 12:56 PM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
dustyroads Offline


Registered: 05/13/13
Posts: 303
Loc: upstate NY
Originally Posted By: Donald
I remembered that for this entire OCI I added Auto-Rx. The people at Auto-Rx say its possible the Auto-Rx is loosening some hardened oil deposits and that is why the oxidation is high. Its also possible the hardened oil deposits contain wear metals like lead (from break-in) that are coming out with the hardened oil deposits.


Maybe that's it.
_________________________
2011 Taurus sel

2012 Volvo big rig with D11

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#3399224 - 06/16/14 07:43 PM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
KCJeep Offline


Registered: 06/30/11
Posts: 4615
Loc: Mahzurrah!
Well it was trending down and you added RX now it's back up. Could be something the RX did or could be the RX itself who really knows what's in it?

If it's running great I'm not ready to push the panic button this engine has been throwing high numbers it's whole life.
_________________________
2004 Jeep GC WJ 4.0 @ 122k Pennzoil HM 10w30 w/MoS2
Napa Silver 31515
KIA Sedona 40k, Chevy Lumina 173k, Chrysler Sebring 171k.

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#3399721 - 06/17/14 11:48 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
yvon_la Offline


Registered: 05/20/14
Posts: 740
Loc: quebec canada
Full calcium formulation isnt good for 10000 miles! You probably added oil wich would explain the tbn
_________________________
Truck driver
Nissan versa note s 2014
Mechanicly inclined

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#3400165 - 06/17/14 09:58 PM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: Donald]
Merkava_4 Offline


Registered: 01/30/07
Posts: 9384
Loc: Clovis, CA
Originally Posted By: Donald
I remembered that for this entire OCI I added Auto-Rx.


I think that's your problem right there. That would explain the iron shooting up too.

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#3402812 - 06/21/14 07:13 AM Re: 2001 Jeep GC 4.0 with Rotella T6 5679 miles [Re: yvon_la]
Donald Offline


Registered: 03/21/04
Posts: 13535
Loc: Upstate NY
Originally Posted By: yvon_la
Full calcium formulation isnt good for 10000 miles! You probably added oil wich would explain the tbn


T6 has gone 18K miles on my Cummins diesel with an excellent UOA, so I would have to disagree with your comment. No oil added that I remember.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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