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Old 07-22-2016, 06:34 AM   #1
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Oil and Filter interval

ISB 6.7 340HP
Changed my oil and filter yesterday 6K miles and oil was black. Cummins recommends 15K. I usually change at 5 to 6K, was just wondering what others are doing ?
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Old 07-22-2016, 07:20 AM   #2
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When I change my oil it is also black. As soon as I change the oil and as I check the level while traveling you can see that it almost immediately turns black, this is the nature of the beast with diesel engines.

I change my oil annually unless I am in the middle of a trip and using the coach, I will run it a little longer and change when I get home. I try to change it in the fall before we put the rig up for the winter. In 2009 we put 15K miles on the rig because we took a trip to AK. Normally we will put 5-7K miles a year on.
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Old 07-22-2016, 07:24 AM   #3
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Once a year or 15Kmi

Or sign up for Cummins QuickServe Website
https://quickserve.cummins.com
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Old 07-22-2016, 07:56 AM   #4
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The reason it turns black right away is because there are a lot of places that the old oil collects that doesn't get drained out. It doesn't hurt anything, but makes the oil black soon after changing it.
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Old 07-22-2016, 08:05 AM   #5
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Quote:
Originally Posted by scooterbob View Post
ISB 6.7 340HP
Changed my oil and filter yesterday 6K miles and oil was black. Cummins recommends 15K. I usually change at 5 to 6K, was just wondering what others are doing ?
I have changed oil in my 02 Journey approximately every 6,000 miles since new. On several occasions I let it go 10,000.

Just got back from a 6,800 trip and the oil just went below the add line. The coach has 202,000 miles.
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Old 07-22-2016, 10:28 AM   #6
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My Cummins ISL recommends 20,000 mi between changes and I use that as to when to change oil. In addition, I have my oil analysis done by Blackstone at the same intervals and it supports the 20,000 mi change interval. We're at 60,000 miles on the Bus so the "annual" change and the 20k falls at about the same time. If you're concerned, get the oil analyzed. Color doesn't have a thing to do with the quality of the oil.
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Old 07-23-2016, 05:59 AM   #7
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Pigman1, I called Cummins the other day and also look on Cummins QuickServe website. Both stated 1 year or 15 K miles not 20,000. You may want to verify this for yourself by calling
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Old 07-23-2016, 11:43 AM   #8
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Pigman1, I called Cummins the other day and also look on Cummins QuickServe website. Both stated 1 year or 15 K miles not 20,000. You may want to verify this for yourself by calling
It depends on the exact ISL model you have, what it's installed in and how it's used. I've checked both the books and with Cummins.
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Old 07-23-2016, 12:25 PM   #9
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Pigman1, I called Cummins the other day and also look on Cummins QuickServe website. Both stated 1 year or 15 K miles not 20,000. You may want to verify this for yourself by calling

Pigman1 is right. Cummins calls out 20,000 miles for an ISL in motorhome service.

https://cumminsengines.com/showcase-...00#maintenance
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Old 07-23-2016, 12:45 PM   #10
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Quote:
Originally Posted by scooterbob View Post
ISB 6.7 340HP
Changed my oil and filter yesterday 6K miles and oil was black. Cummins recommends 15K. I usually change at 5 to 6K, was just wondering what others are doing ?
scooterbob
Most of us follow the engine manufactures recommendations.
If you call Cummins Care at 1-800-343-7357 with your engine serial number they will give you the correct recommendations for your particular engine.
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Old 07-24-2016, 07:15 AM   #11
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The oil is black because it is carrying contaminants which it supposed to do. If the oil didnt do this you would get a sludge buildup inside the engine.
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Old 07-24-2016, 09:31 AM   #12
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Have you ever followed a diesel truck? Did you see the black smoke when he floor boards it? Diesel fuel has more oil in it. It makes more black soot. It comes off the wall of the cylinders and collects in the oil. Oil will always be black when changed in a diesel.
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Old 07-24-2016, 09:36 AM   #13
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Black oil after change is normal for any around 2004.5 year cummins, more so with egr, and diesel emissions equipped rigs, not from contaminants, non oil flow, just nature of the beast, sorry for posting a link to another forum, but this one explains it well. I've have many cummins equipped trucks oil was for the most part clean looking between changed, but with the modern emissions wonderful stuff, oil is black almost right away, remember just because oil is black, certainly does not mean it's dirty/bad/needs to be changed, it's not 1980's or prior anymore, just about all oils now-a-days are fantastic!

6.7 Black Oil - Dodge Diesel - Diesel Truck Resource Forums
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Old 07-24-2016, 02:30 PM   #14
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Quote:
Originally Posted by Steve Ownby View Post
Pigman1 is right. Cummins calls out 20,000 miles for an ISL in motorhome service.

https://cumminsengines.com/showcase-...00#maintenance
My ISL also calls for 20,000-mile oil and filter intervals OR 12 months, whichever comes first. I average 15k a year so I do annual oil and filter changes... it'd probably take me and extra 4-6 months if I waited to tick over to 20k. I don't think that would hurt anything, but if we're going by the recommendations from Cummins that means annual oil and filter changes.
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