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Old 09-14-2020, 02:40 PM   #1
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Cummins 6.7 oil change interval

My Isata 5 is on a Ram5500 with a cummins 6.7 diesel. Looking at the owners manual on he same page it says (in bold), "Replace the engine oil and oil filter every 15,000 miles or six months ..." That seems like a lot. Its a new truck with just $5k miles on it. It also says synthetic oil only if being used in <0deg F, otherwise use standard 15-40 non synthetic. That also seems different. I have a 6.6 Duramax in one of my Chevy's and change it every 5k, and its usually jet black by then, and this truck only has 36k on it.
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Old 09-14-2020, 03:14 PM   #2
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I had mine changed at 5k miles and then I will go to every 7.5K. Remember the oil has been in the crankcase since the chassis was manufactured. In my case that was 8 months before I picked up the RV. I didn’t want to run with oil that had been sitting that long.

Took at to RAM dealer and they used this Mopar oil.
68438447PA 3 OIL-10W30 SYNTHETIC
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Old 09-14-2020, 03:27 PM   #3
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That's a great point I completely missed. Thanks Milkman
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Old 09-14-2020, 03:32 PM   #4
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I change mine every 6 mo even though I only drove 3-5000 miles.
Seems like the new oil gets black the moment I start it, could have something to do with emission controls..especially the EGR.
When in doubt follow manufacturer recommendations, especially when it's under warranty.
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Old 09-14-2020, 03:40 PM   #5
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Manual is 15k like all good engines using synthetic. Synthetic doesn’t have viscousity breakdown as easily as non synthetic and filtration is better these days, so it can go longer. I’ve been following the 15k full synthetic routine on one of my vehicles for almost 20 years with no problems. I follow the manual and that works for me, I don’t feel the need to second guess world class companys’ recommendations
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Old 09-14-2020, 03:54 PM   #6
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I had the same concerns and had my oil analyzed at 10k. The report said, go longer.
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Old 09-14-2020, 08:01 PM   #7
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Pretty cool feed back. In my younger years I changed the oil as soon as it started darkening. Apparently that's normal for the diesels. You'd never know I've owned several for 15+ years. Milkman55 had a great point. I bought a new 2020 Isata Ram5500 to my shock discovered after the fact it's on a 2018 cab/chassis. So two year old oil. I'd say well past the six month rule. I'd have overlooked that since I only have 5k mileage. Sorry about the Pabst Blue Ribbon.
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Old 09-15-2020, 07:08 AM   #8
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Does anyone have a P/N for the oil filter that's needed for the Gen 5 Cummins 6.7? The EBay web sites say that the 2019 filters don't fit the 2020/1 5500 C&C applications. These EBay apps are hopeless and I could always ask my dealer but asking here JIC.
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Old 09-15-2020, 10:48 AM   #9
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According to Geno's garage which is set up to support the Cummins engines in both the pick-up and C&C model trucks, which the 5500 is one. There are two different oil filters that can be used. The first filter which has the standard media is LF3972 and the second filter which is the StratePore media is LF16035. These filters work on all 5.9L and 6.7L Cummins engine built from 1989 to 2020.

I use only the StratePore Filter since it has improve filtering capabilities over the standard filter. If you want even a more improved oil filter, you could use a Donaldson Filter DBL7349 engine oil filter which is a Nanofiber Synthetic.

What year is your 5500? I'm assuming it's a 19 or 20 since it has so few miles. If that's the case you need to be running 10w-30 or 5w-40 synthetic only.

From TSB 09-011-20

CAUTION! 15W40
grade oil CAN NOT be used in any 2019 model year or newer 6.7L
equipped vehicles due to the new designed valve train of this engine. If this oil is
used, it will cause deposits to form in the Hydraulic Valve Lash Adjusters leading
to undesirable noise, and/or engine damage.

I would ask your Ram truck dealer for a copy of this TSB.


Also make sure that you have had this recall applied to your C&C model truck, NHTSA 20V511. It is for engine warm up protection to prevent engine failure.
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Old 09-15-2020, 11:58 AM   #10
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Thanks Jim. Really helpful. I found the TSB on the FCA web site and Brian has commented on their compliance with the requirements for the ECY flash update before delivery on all the coaches being delivered from the date of the recall.
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Old 09-15-2020, 12:07 PM   #11
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Jim. My 5500 is a 2018, which i was disappointed to discover, to say the least, being new to the motorhome thing, that they would call a 2020 Isata, that was built on a 2018 cab/chassis. But after some research, apparently this is not out of the ordinary. I just think it should have been disclosed to the new buyer. Anyway, I am dealing with 2018 cummins 6.7. Not sure what a TSB is, or what the FCA website is.
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Old 09-15-2020, 12:28 PM   #12
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Quote:
Originally Posted by Invisibleman View Post
Not sure what a TSB is, or what the FCA website is.
TSB - Technical Service Bulletin
FCA - Fiat Chrysler Automobiles (which owns RAM)
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Old 09-15-2020, 01:03 PM   #13
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I was able to get the build sheet, thanks for that.
It seems I have a 2018 6.7L I6 Cummins Turbo Diesel Engine.
I am a bit unclear if this should, or should not be using the full synthetic. I'm not sure how you can go wrong with full synthetic, but the owners manual says not to if operating => 0 feh deg.
It does seem clear the filter is the same, regardless, and I am going to go with the StrataPore LF16035. I do still do my own oil changes because I don't trust the dealers.
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Old 09-15-2020, 01:08 PM   #14
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Quote:
Originally Posted by Invisibleman View Post
Jim. My 5500 is a 2018, which i was disappointed to discover, to say the least, being new to the motorhome thing, that they would call a 2020 Isata, that was built on a 2018 cab/chassis. But after some research, apparently this is not out of the ordinary. I just think it should have been disclosed to the new buyer. Anyway, I am dealing with 2018 cummins 6.7. Not sure what a TSB is, or what the FCA website is.
Model years are misleading by OEM design: new models are mostly but not always released in Q3 of the year nominally named as the next year's model. So essentially every 5500 delivered to a fleet buyer like Forest River after September 30 2020 would be a 2021 models except if their orders were processed as 2020 models. Then by definition the build quantity of 2020 models will be all those orders irrespective of when they are delivered and even if delivered to Forest River in 2021. Which also means that although Forest River may deliver to a customer in 2021, as a 2021 model, in the first 90 days of 2021 this will probably include a 2020 chassis. I suspect this what happened to you.

Then some of the truck manufacturers change their specifications much earlier in the preceding year (say in May) such that all trucks delivered after that may be 2021 models. Ford has done this fairly often with the F-150 which being the most popular vehicle in North America often sells out its planned build for a given year long before the regular model change over date thus prompting an early announcement, price increase and delivery of the next year's models.

The reverse can also happen such that there is no model change over and in this example, 2020 models are sold and delivered well into 2021 so that a new model can be launched with major changes at the end of 2021.

More than you may have wanted to know but your 2018 model was the last year of what is known as the Generation 4 of the truck so in theory should be robust. The 2019 models had their issues as evidenced by the TSB but thats life in the fast lane!
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Old 09-15-2020, 01:12 PM   #15
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I was able to get the build sheet, thanks for that.
It seems I have a 2018 6.7L I6 Cummins Turbo Diesel Engine.
I am a bit unclear if this should, or should not be using the full synthetic. I'm not sure how you can go wrong with full synthetic, but the owners manual says not to if operating => 0 feh deg.
It does seem clear the filter is the same, regardless, and I am going to go with the StrataPore LF16035. I do still do my own oil changes because I don't trust the dealers.
The 2019 Owners Manual is quite clear that it should be synthetic oil. I have many vehicles and not one of them back to 1985 recommends anything else but synthetic.
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Old 09-15-2020, 01:21 PM   #16
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That is one way of looking at it. I must say, the engine is a beast. Picked it up from the dealer at 6pm, and by 7pm was headed to I-40, through Flagastaff (8000') and across some lower Rockies to the East Coast 2800 miles later. Flawless trip. The best part of the purchase seems was the cab/chassis. Exceptionally quiet, impressively powerful at any altitude, and along with the unexpected exhaust brake, in auto mode, it practically drives itself up and down the mountains. That said, now I am just trying to get the right engine oil. Follow the manual, 0 deg or above operation, 15-40 non-synthetic. Below 0 deg, 5-40 synthetic. Go figure. Maybe it breaks in better with non-synthetic.
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Old 09-15-2020, 01:39 PM   #17
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Originally Posted by Invisibleman View Post
That is one way of looking at it. I must say, the engine is a beast. Picked it up from the dealer at 6pm, and by 7pm was headed to I-40, through Flagastaff (8000') and across some lower Rockies to the East Coast 2800 miles later. Flawless trip. The best part of the purchase seems was the cab/chassis. Exceptionally quiet, impressively powerful at any altitude, and along with the unexpected exhaust brake, in auto mode, it practically drives itself up and down the mountains. That said, now I am just trying to get the right engine oil. Follow the manual, 0 deg or above operation, 15-40 non-synthetic. Below 0 deg, 5-40 synthetic. Go figure. Maybe it breaks in better with non-synthetic.
The dino oil spec above 0 deg is an allowable, non damaging alternative. Its also less expensive but its certainly not equivalent. Synthetic oil is the way to go. Its way better than the minimum requirements and its quite feasible to run any good synthetic up to 2X the recommended change intervals and just change the filter. But even that is not essential. The oil companies are unwilling to force a change of maintenance habits because they are onto a good thing with most of us changing way more often than we need ut feeling SO much better about doing so. Truck fleets in Africa are changing every 2 years or 50,000 kms on Hino and Toyotas and seeing million kms before they fall apart from lack of other maintenance. The motors then go onto generator service where the oil is often never changed unless a rebuild is needed usually because of a coolant or turbo charger system failure.

Mind you, I am not advocating this practice especially in the US where we have an Autozone or Quick Change on every corner. Nor would I go beyond 7000 miles on the first change. But after that it does not need to be the religion that so many practice in the hope that it will buy them an extra $$$ at sale or trade in where age and mileage are bout the only determinants of base price.
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Old 09-15-2020, 03:08 PM   #18
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Invisibleman; I sent you a private message on your Cummins engine.
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Old 09-16-2020, 06:06 AM   #19
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I don't have a RAM but I do have a diesel. I change the oil every 5000 miles, using Shell Rotella T6 5w-40.

Some say Im wasting money replacing oil that still has life in it. I think that oil is cheap, engines not so much.

The reason the oil gets black almost immediately is the soot created by the diesel and the EGR valve which recirculates that soot laden air back into the engine.

But I can tell you from personal experience the EGR is not the root cause, mine fell off and the oil still gets black quickly.
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Old 09-16-2020, 06:13 AM   #20
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Synthetic oil is so much better. I use it in all of my vehicles. I change the oil in my gassers and Jeep Liberty diesel once a year no matter how many miles. It has worked for 25 years without problems. My 6.0 Ford is different. It has problems if you don't change the oil regularly because the injectors are cooled by the oil. I sent my oil in to Blackstone at 5000 miles. They recommended changing it at that interval. It might be worth the money to have your oil tested a few times. That will tell you what you need to know.
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