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Old 12-04-2014, 04:29 AM   #1
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Oil Change Frequency - Cummins 8.8 litre

How many miles between oil changes?
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Old 12-04-2014, 04:32 AM   #2
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Generally the accepted time frame is every 15K miles or 1 year, whichever is sooner. You can always have the oil tested if there is a question, but I figure which is more expensive, and oil change (with all filters) or and engine rebuild because of bad oil????
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Old 12-04-2014, 07:39 AM   #3
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Usually I change mine every year. But I just had an oil analysis done by Blackstone Labs, and they said I was good for at least another 7K. I'm going to do another oil check at 5K since it's cheap to get it done. Only $15.
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Old 12-04-2014, 08:17 AM   #4
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I've yet to come close to the mileage in a year so once a year I do oil and filters
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Old 12-04-2014, 08:36 AM   #5
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I drove my Cummins less than 3,000 miles last year and it is stored indoors when not on the road. I do my own service and an oil change is under $100, so I just go for it. I suppose if I were paying $400-$500 for,that service I would do the sample. I realize of course that the sample advises on other factors than is a change is due.
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Old 12-04-2014, 08:59 AM   #6
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I also drive the coach about 6000-7000 miles/year, so change the oil yearly rather than on mileage. I do my own, so oil & filter for the Cummins ISL (8.9L) comes to a bit over $100.
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Old 12-04-2014, 09:51 AM   #7
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Quote:
Originally Posted by Ramets View Post
Usually I change mine every year. But I just had an oil analysis done by Blackstone Labs, and they said I was good for at least another 7K. I'm going to do another oil check at 5K since it's cheap to get it done. Only $15.
ramets, i remember i have been paying $25, did you buy bulk?
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Old 12-04-2014, 11:18 AM   #8
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The newer common rail injection style Cummins engines used in motor homes have a 20K interval recommendation. As with the older ones the yearly service still applies.

I recently had an oil analysis done by Blackstone just to get an idea of the general engine condition. The results said there was a trace amount of elements in the oil consistent with the compounds in ethylene glycol coolant. If I hadn't spent the money on that test I would have had no indication of a potential problem.
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Old 12-04-2014, 05:58 PM   #9
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Thanks for all of the replies. I'm a do it yourselfer so will likely go with the once a year to be safe.
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Old 12-05-2014, 07:21 AM   #10
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ramets, i remember i have been paying $25, did you buy bulk?
You're right it's $25. I fat fingered it.
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