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Old 03-23-2014, 10:23 AM   #15
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TBS-POPS,

I found this pretty good presentation on DPF Regeneration, see below.

The discussion on the issue with oil contamination starts at 18:45 in the video. It may not apply to the Cummins. I think it all depends on the regen process selected for each engine. I think he was explaining that some engines pump some of the exhaust back into the cylinder to burn off some of the soot, which contaminates the oil.

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Old 03-23-2014, 11:24 AM   #16
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IF the EGR and the extra fuel injected to burn off the soot is getting by the rings to contaminate the oil to a degree that is harmful your engine is worn out. This is why you do oil samples to determine when it's time to rebuild at higher mileage intervals.
Yes. Thanks for the comment, since that's exactly the reason why I started this thread.

I know diesel engines can go more miles than most of us will ever drive, but, when buying used, we must worry about these kinds of things. So I worry about how the coach that I'll be buying has been cared for.

Do you recommend that before I buy a used coach that I should have the oil examined first? Would that be able to tell me some useful information about the state of the engine? What else can a prospective used DP buyer do in this respect?
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Old 03-23-2014, 11:32 AM   #17
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Yes. Thanks for the comment, since that's exactly the reason why I started this thread. I know diesel engines can go more miles than most of us will ever drive, but, when buying used, we must worry about these kinds of things. So I worry about how the coach that I'll be buying has been cared for. Do you recommend that before I buy a used coach that I should have the oil examined first? Would that be able to tell me some useful information about the state of the engine? What else can a prospective used DP buyer do in this respect?
Having a sample of both the oil and the transmission fluid analyzed is an excellent precaution. Here are a couple of labs:

http://www.jglubricantservices.com/online_store.html

http://www.blackstone-labs.com/
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Old 03-23-2014, 11:41 AM   #18
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Having a sample of both the oil and the transmission fluid analyzed is an excellent precaution. Here are a couple of labs:

JG Lubricant Services, LLC

Blackstone Labs
Steve,

Thanks for all the good information you have provided in this thread. I continue to be amazed at the help that can be found in this forum.
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Old 03-23-2014, 11:45 AM   #19
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Steve, Thanks for all the good information you have provided in this thread. I continue to be amazed at the help that can be found in this forum.
Happy to help. Knowledge is power.
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