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Old 02-01-2013, 03:28 PM   #1
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C9 oil change interval

I see a lot of people on this forum saying you need to change the oil in a C9 engine 3 or 4K miles. Is that correct and what does the cat owners manual say. reason for asking I looking to move to a DP trying to gather info on the cat, thank for any info
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Old 02-01-2013, 03:54 PM   #2
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C-9 15,000 or yearly which ever comes first. Go to cats web site everything you want to know. You can call with serial number and they will tell you everything about that motor.It holds 34 quarts every 3,000 miles would be a alittle much.
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Old 02-02-2013, 07:01 PM   #3
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Cat has three criteria for oil change interval. They are miles-calendar- or fuel used. I don't know what they are for a C-9 but for my C-7 they are 11,000 miles or 12 months or 1100 gallons of fuel burned. So If I average 7 mpg that woulds make the interval 7700 miles. 7.2 mpg is pretty close for me. For my engine they recommend 10-30 oil that meets Cat spec. I buy my oil from the Cat dealer in a 5 gallon pail for about $97.00. My engine takes 19 quarts.

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Old 02-02-2013, 07:15 PM   #4
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My CAT Service Manual (C7) says 11,000 miles or 1,100 gallons of fuel or 250 service hours or 6 months

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Old 02-02-2013, 08:07 PM   #5
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I use a little bit of what I consider common sense with the calendar based changes. It is not unusual for us to put less than 1000 miles on our coach during the winter 6 months. I do not throw away oil that has 200 miles on it because it has set in the storage cover for most of 6 months. We probably don't get 3000 miles in a year.

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Old 02-02-2013, 08:18 PM   #6
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have never been faced with the 6 months issue. I hit 11,000 pretty easy in 6 months or less.
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Old 02-05-2013, 09:59 AM   #7
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Your best bet is don't listen to anybody and call cat. Or go to cats. Web site.
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Old 02-05-2013, 10:13 AM   #8
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If you have it your Cat Engine Owners Manual has all that information.

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Old 02-08-2013, 01:26 AM   #9
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Every "Big Truck" I've ever owned always seemed to start losing fuel economy around 7500 miles from the last oil change,...so i always change mine every 8k miles. That's my experience based on 3 Sportchassis,...2 powered by MBE900, 1 powered by a C6 cat, a Peterbilt conversion motorhome powered by a C15 Cat.
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Old 02-08-2013, 09:47 AM   #10
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Your oil change interval policy fits pretty well with Cats recommendation to change every 1100 gallons of fuel burned I would guess.

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Old 02-08-2013, 12:10 PM   #11
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Per cat. On the Internet C-9 is 20,000 miles or 1 year which ever comes first. You can go to catrvclub tech talk.
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Old 02-08-2013, 05:47 PM   #12
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Rooster,

The C-9 may be different than the others but I doubt it. If you don't have a Cat Engine Owners Manual for your engine you might call Cat Tech Support. Most of the other Cat engines have the three criteria for change. Miles, Calendar or Gallons of fuel burned. My C-7 says 11,000 miles,one year or 1100 gallons of fuel burned. So at 7 mpg and that is fairly common the interval would be 7700 miles and not 11,000 miles for mine. My engine manual also says to use 10-30 oil that meets Cat Oil Spec and not the 15-40 I was using before I read the manual.

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Old 02-09-2013, 06:04 AM   #13
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Quote:
Originally Posted by jauguston View Post
Rooster,

The C-9 may be different than the others but I doubt it. If you don't have a Cat Engine Owners Manual for your engine you might call Cat Tech Support. Most of the other Cat engines have the three criteria for change. Miles, Calendar or Gallons of fuel burned. My C-7 says 11,000 miles,one year or 1100 gallons of fuel burned. So at 7 mpg and that is fairly common the interval would be 7700 miles and not 11,000 miles for mine. My engine manual also says to use 10-30 oil that meets Cat Oil Spec and not the 15-40 I was using before I read the

Jim
I believe the C-9 holds nearly twice a much oil as a C-7, my C-9 holds 34 quarts and my c-9 manuals states the above post. It also states I can use 10-30 or 15-40 depending on what temps you drive in. I change mine yearly with about 5,000 on the oil with all fuel filters and the genny.
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Old 02-09-2013, 09:37 AM   #14
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My C-7 manual says the same thing about 10-30 and 15-40. Since most of my driving is in temperatures below 100 degrees it says I should use 10-30. Cat Tech Support also told me to use 10-30 as it was better for the HEUI fuel system.

Jim
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