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Old 12-22-2010, 09:58 PM   #1
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Diesel engine oil - confused

This is certainly the simplest question ever posted but I am really confused.

I have a 2005 Dutchstar 350 diesel cummins engine and I need to put oil in it put don't know what kind.

The manual says to use a SAE 10-40 oil. Is this the same oil that you would use in a gasoline engine or is there a specific oil used for diesel engine?
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Old 12-22-2010, 10:07 PM   #2
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Old 12-22-2010, 10:14 PM   #3
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For a diesel engine you need to use an oil like Chevron Delo 400 or Shell Rotella that is rated for a diesel service rating of API CH-4 or newer for your year engine, the new DPF engines require API CJ-4.

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Old 12-22-2010, 10:14 PM   #4
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Oil for Cummins

As a former Cummins Technician, yes there is a difference; diesel oils are formulated to "handle" a higher carbon content because of the carbon that is contained in diesel fuel. That is why you can change the oil in a diesel today and 2 days later it is pitch black. The high carbon content of combusting diesel fuel is responsible for this. For years, Cummins has used Shell Rotella engine oil.
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Old 12-22-2010, 10:16 PM   #5
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Quote:
Originally Posted by Bmoore_50 View Post
The manual says to use a SAE 10-40 oil. Is this the same oil that you would use in a gasoline engine or is there a specific oil used for diesel engine?
The manual will also tell you the API (American Petroleum Institute) rating oil to use.
I used Shell Rotella 15 W 40 in my 8.3 liter 350 HP Cummins ISC before switching to synthetic. You can check but I feel pretty certain that Rotella will meet the API specs cited in your engine manual.
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Old 12-23-2010, 02:32 AM   #6
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Shell Rotella or Chevron Delo 400 15W-40 dino oil will keep your Cummins happy for many hundreds of thousands of miles. If you're lucky, you might still find some API CI-4+ oil around, but the current requirement for most EGR, DPF and catalyst equipped diesels in the U.S. is CJ-4 - the additive package in the latter has been reformulated not for better engine protection but to reduce ash in the exhaust that plugs the emissions gear.

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Old 12-23-2010, 03:45 AM   #7
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Shell Rotella AT WAL-MART $29.98 @2.5 GAL.
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Old 12-23-2010, 06:38 AM   #8
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Shell Rotella 15w40, always used it in all my diesel engine trucks heavy equipment, over 40 years. Walmart has it.
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Old 12-23-2010, 06:39 AM   #9
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Thank you

Thanks to all who replied. It seems so simple but the manuals don't explain everything simply.

It is a pleasure to have so many helpful Rv'rs , such a nice family.

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Old 12-28-2010, 11:58 PM   #10
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Use a good quality series 3 engine oil - The Rowtella or Dello are just fine for your application, but definitely stay with a Fleetguard(Cummins) oil filter, The cost of the filter may be slightly higher than a jobber or will fitter, but the quality of the filter will insure a very long life for your engine - There is nothing close in quality.
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