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Old 09-12-2018, 07:10 PM   #1
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Cummins ISL no longer 12 months, 20,000 mile oil changes for RVs?

According to the manuals on Cummins quick serv for my ESL it now lists the oil change frequency at 6 months, 6,000 miles regardless of it being a commercial vehicle or an RV.

They used to list it as 20,000 miles or 12 months for RVs.

Spartan sent me both manuals, with the old and new requirements and when I questioned that, they told me to ask Cummins, because they had recently changed their oil change frequency. When I contacted Cummins, they directed me to the manual on quick serv.

Anyone else aware of this change? Do they still have an alternate schedule for RVs that I'm failing to find?
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Old 09-13-2018, 03:02 PM   #2
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FWIW, if anyone runs into this same problem.

I called 1800Cummins and they told me what they did in email, that if quick serv says 6 months, then it's 6 months. I said it conflicted with what Spartan said and they said I could call sales and service. They asked my zipcode and gave me the number for Little Rock.

I called and talked to Little Rock Cummins and they told me that Cummins doesn't have any hard and fast time/miles rules, but instead only recommendations. That for RV's, somewhere around 15,000 miles is about right. He said if it's a lot of stop and go, maybe 10-12,000, and if it's cross country, 15,000 or more.

I said, so I should just plan on annually as I will fall way short of the 10,000 a year, and he said only if I get up close to that 15,000 mark. He said these days the oil doesn't break down and he said I could go up to three years if I didn't hit the mileage.

I asked if Cummins would deny warranty based on exceeding an oil change interval and he said no. He said the only time they deny warranty within the warranty period is if they check the computer and see a lower oil pressure warning, high oil temp, high coolant temp, etc.

I would feel better if the manual didn't have the 6 month, 6,000 mile chart, but based on what he said, I'll probably plan on just getting it changed every year or so.
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Old 09-13-2018, 07:18 PM   #3
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Quote:
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...

I said, so I should just plan on annually as I will fall way short of the 10,000 a year, and he said only if I get up close to that 15,000 mark. He said these days the oil doesn't break down and he said I could go up to three years if I didn't hit the mileage...
That is *very* interesting in my book. We do about 5-8 K miles a year, which would mean oil changes every two years instead of the annual change I now do.
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Old 09-13-2018, 09:15 PM   #4
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1 year or 15,000 miles, whichever comes first.
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Old 09-15-2018, 08:10 PM   #5
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Interesting, but one consideration for those with extended warranties from other than cummins....


My traveling buddy had a turbo replaced and the first thing they asked for was receipts for oil changes and you KNOW they will use any excuse NOT to pay a claim !!!


So best be very conservative...
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Old 09-15-2018, 08:34 PM   #6
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Interesting, but one consideration for those with extended warranties from other than cummins....


My traveling buddy had a turbo replaced and the first thing they asked for was receipts for oil changes and you KNOW they will use any excuse NOT to pay a claim !!!


So best be very conservative...
Agreed. I'm going to see exactly what mine says. On my ACE, it listed oil changes at 6 months or 7500 miles. I decided to sell it and get the Ventana very early on, so when I last drove it, it was at 4700 miles. I knew the oil change was 7500, and I thought it was 12 months.

When I tried to transfer the warrant to the new private seller, they said no, because even though I was well below the mileage, I was at 8 months and hadn't had it serviced. Fortunately, they did do the pro-rated refund and the buyer agreed to give him the money from the refund.
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Old 09-22-2018, 11:11 PM   #7
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The Owners Manual for my 2015 ISL9 Maintenance Schedule, Oil Drain Intervals, shows "Average Vehicle Speed Higher than 40 mph, Recreational Vehicle, 20,000 miles or 12 months."

Will this not be safe in dealing with an Extended Warranty company? Or will Cummins send out different schedules to all Cummins Engine users?
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Old 09-23-2018, 07:15 PM   #8
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Cummins needs to get a handle on this. As oil gets better and engines run cleaner, mileage between changes should go up, not down.
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Old 10-10-2018, 01:42 PM   #9
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Did the first oil change and lube myself at 10K miles in December of 16. Now almost two years later we only have 17K miles so I still haven’t changed the oil. Going to Texas in April so I will wait until that 1500 mile trip is done. I do use Rotella T6 5-40 full synthetic oil. Use the same oil in the genny, at around 150 hours. Genny has around 560 hours on it and Cummins only around 300 total hours. Don’t sweat the small stuff.
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Old 11-21-2018, 10:14 PM   #10
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OK, Cummins finally fixed their manual on quickserve.cummins.com and it now has the full chart like they used to, which lists RV (averaging 40+ MPH) at 12 months/20,000 miles.
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Old 11-26-2018, 09:10 AM   #11
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In all our vehicles I use full Synthetic, and do not have concerns about oil breaking down or becoming acidic while sitting for long spells. I plan on going 20,000 before an oil change in our 2008 Tiffin Cummings 425 ISL. Any problems we shall post them. Thanks, Benalee
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