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Old 12-22-2011, 10:43 AM   #15
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It's 15,000 miles. See http://cumminsengines.com/assets/pdf/4971287.pdf

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Old 12-22-2011, 10:33 PM   #16
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My engine is the "mechanical" 8.3, aka the CTA engine and manual states 6,000 miles. I'm guessing you have the ISC 8.3. Hope this clears up the different change intervals.

'99 Alpine Coach
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Old 12-23-2011, 12:09 AM   #17
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Personally If i owned a newer common rail diesel I change it more often than the older ones, since they have the High pressure pump to power the injectors.
(and those pumps are really high dollar)
(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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Old 12-23-2011, 08:48 AM   #18
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Jeff, Shortler did not say what year his coach is or what engine he has so I assumed the ISC which was the most common engine installed after 1998. My '98 has the 6CTA like yours but there are very few of these around, I am surprised your '99 has one unless it was actually built in '98. I know the WRV manual states 6,000 miles but the 6CTA is the same engine block as the ISC and a Cummins mechanic told me to use the same figures as the ISC so I am going with 15,000. A moot point since I do less than 6,000 a year anyway.
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Old 12-23-2011, 10:20 PM   #19
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New here, so take this free advice - I'm sure it's worth every penny...

I'm a fan of oil testing. Two major benefits:

1. We're not talking about a standard 5 qt oil change in a car here. Seems like quite a waist of a lot of potentially good oil. The test can tell you the quality of the oil in your engine better than the standard preventative milage or time intervals (which are really just guesses based on an issue which really has too many variables to count - IMHO).

2. The test can catch other problems early by identifying things that shouldn't be there (like antifreeze). That can mean the difference between a cheap fix vice a break-the-bank fix.

So, at a minimum a test is relatively cheap. AND, it has the potential to save you a bundle.

There you have it. Now don't go spending it all in one place!

The Family Man

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