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Old 05-07-2014, 06:30 PM   #1
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Finding right oil

According to the manual I have for my motor 2011 Cummins ISL 380, it lists 15W-40 as first choice the 10W-40 as second. Has anyone else had issues finding 15W-40 Synthetic in your area? Had my oil changed here in Jamestown NY last month and truck repair service (largest truck repair in our area, not a small fly by night outfit) had issues finding a full synthetic in 15W-40 weight.
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Old 05-07-2014, 07:06 PM   #2
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According to Cummins there is no difference in change interval for dino or synthetic motor oils. In my last 3 class A's I've used 15W-40 Rotella (DINO) and also tested my oil at each factory change interval. Tests showed no lube breakdown and no engine wear to be concerned about. This is over about 150,000 total miles since 2006. With those statistics I don't see the justification for the increased cost of synthetic oil. I do all my own maintenance.
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Old 05-07-2014, 07:06 PM   #3
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It shouldn't be too hard to find motor oil in the weight you need. The main thing I've learned about oil in a diesel is that you not only have to look at the weight, you have to look at whether it is rated for diesel. Some oils are only rated for gasser vehicles. Have you checked at Walmart?
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Old 05-07-2014, 07:10 PM   #4
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According to Cummins there is no difference in change interval for dino or synthetic motor oils. In my last 3 class A's I've used 15W-40 Rotella (DINO) and also tested my oil at each factory change interval. Tests showed no lube breakdown and no engine wear to be concerned about. This is over about 150,000 total miles since 2006. With those statistics I don't see the justification for the increased cost of synthetic oil. I do all my own maintenance.
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Old 05-07-2014, 07:22 PM   #5
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According to the manual I have for my motor 2011 Cummins ISL 380, it lists 15W-40 as first choice the 10W-40 as second. Has anyone else had issues finding 15W-40 Synthetic in your area? Had my oil changed here in Jamestown NY last month and truck repair service (largest truck repair in our area, not a small fly by night outfit) had issues finding a full synthetic in 15W-40 weight.
Finding Synthetic oil should not be a problem 15-40 is used in most large diesel engines. Rotella (Shell) makes one and so does Valvoline which carries a Cummins endorsement. A lot of these diesels have made 500k miles or more with conventional oil, so the move to synthetic is a personal choice and will probably not affect the motorhome during the time that you own it.
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Old 05-07-2014, 07:27 PM   #6
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Thanks Pale, we rely on you as our resident refining expert!!
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Old 05-07-2014, 07:31 PM   #7
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Walmart has Rotella 15-40 and a full synthetic 5-40 Rotella which would be even better, if you must have a synthetic. Probably one of the best diesel oils on the market, in synthetic or non.
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Old 05-07-2014, 07:44 PM   #8
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Walmart has Rotella 15-40 and a full synthetic 5-40 Rotella which would be even better, if you must have a synthetic. Probably one of the best diesel oils on the market, in synthetic or non.
Thanks Don!!, I forgot that the Newmar forum has 2 oily experts I haven't looked at the manual, but is the 5-40 synthetic warranty approved by Cummins?
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Old 05-07-2014, 08:39 PM   #9
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You might find this thread from 2003 interesting: Synthetic lubricants-Aren't???
I agree with others, synthetics aren't worth the additional cost. Your engine is designed to last for 500,000 miles before a major overhaul, when using regular diesel oil.
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Old 05-07-2014, 09:19 PM   #10
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Thanks Don!!, I forgot that the Newmar forum has 2 oily experts I haven't looked at the manual, but is the 5-40 synthetic warranty approved by Cummins?
I had to look at a jug to confirm, but Rotella 5-40 synthetic is approved by Cat, Cummins, Detroit and Volvo. As is Rotella 15-40 non synthetic motor oil. If you need to start a diesel in sub freezing temps, that's where the 5-40 syn would really shine.
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Old 05-07-2014, 09:43 PM   #11
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Diesel oils come in 2 weights, 15W40 for conventional oil and 5W40 synthetic. Rotella T is 15W40, T5 is a synthetic blend and T6 is full synthetic. Your conventional oils are cheaper and have been proven for billions of miles over the years, your choice.
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Old 05-07-2014, 10:11 PM   #12
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5W40 Synthetics is definitely the winner in colder climates. Engines start easier, run smoother and the fuel savings in cold weather are significant.
I know of a trucking outfit that switched to synthetics about 10 - 15 years ago they cut the oil change intervals in half, all they do is send in oil samples for testing and change the filters that's all.
The benefits are probably not as drastic in warmer climates but even in hot conditions the viscosity of 5W40 synthetic is more stable, thus keeps it's lubricating and cooling properties.
I would find an oil that is proven to work in the area and stick with it, just stay away from some of the "No Name" brands they are often recycled low quality oils.
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Old 05-08-2014, 08:55 AM   #13
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Ditto on the Rotella 15-40 Dino oil. Buy it at Sam's Club for around $75 a case and change it myself.

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Old 05-08-2014, 12:57 PM   #14
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Ditto on the Rotella 15-40 Dino oil. Buy it at Sam's Club for around $75 a case and change it myself.

WM
Sams is the cheapest around. As far as needing synthetic in cold climates, Cummins recommends using engine preheat if the temp is 40 or lower...type oil makes no difference.
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