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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: 2820
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.
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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: 18192
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.
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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: 18192
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.
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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: 6071
Loc: Colorado
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)
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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: 871
Loc: upstate NY
The iron doubled, too. What happened there? Any relation to whatever is going on with the copper/lead spike?
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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: 871
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.
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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 Online   content


Registered: 06/30/11
Posts: 6651
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.
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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: 1269
Loc: quebec canada
Full calcium formulation isnt good for 10000 miles! You probably added oil wich would explain the tbn
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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: 15468
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: 18192
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.
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