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Old 05-04-2013, 10:30 AM   #1
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Best oil to buy ????

What do you think the best oil to buy for Spartan Chassis, Cummings, ISL, 2007 Dutchstar? Thanks
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Old 05-04-2013, 10:34 AM   #2
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Go with the oil recommended in the manual. I will likely get flamed for this but brand is unimportant as long as it meets the API and SAE specifications. Dino vs synthetic is up to you, I won''t get involved in that war.
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Old 05-04-2013, 10:52 AM   #3
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rotella t 15-40
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Old 05-04-2013, 10:56 AM   #4
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Go with the oil recommended in the manual. I will likely get flamed for this but brand is unimportant as long as it meets the API and SAE specifications. Dino vs synthetic is up to you, I won''t get involved in that war.
I think RoyM is exactly right in this post. Just use a 15w40 by one of the major players. The more important thing is change it annually.
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Old 05-04-2013, 12:05 PM   #5
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I think RoyM is exactly right in this post. Just use a 15w40 by one of the major players. The more important thing is change it annually.
I agree. Ours is done by a Cummins-Onan dealer who uses their own 15w-40 oil. I keep 3-4 qts on hand of Rotella, Delo in case I need to top off before the yrly change. I will say that the oil we use is dino and not the over hyped synthetic stuff.
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Old 05-04-2013, 02:01 PM   #6
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I agree. Ours is done by a Cummins-Onan dealer who uses their own 15w-40 oil. I keep 3-4 qts on hand of Rotella, Delo in case I need to top off before the yrly change. I will say that the oil we use is dino and not the over hyped synthetic stuff.
X2 Certified 15w-40 from any of the manufacturers will do the trick. Just change it yearly and don't worry about it. I carry a gallon of Rotella with me and only use it to top up. Good luck..
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Old 05-04-2013, 02:07 PM   #7
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rotella t 15-40
good for diesels
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Old 05-04-2013, 03:21 PM   #8
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its also good for gas engines i use it in my mercedes all the time....less ash..jeff
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Old 05-04-2013, 04:43 PM   #9
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Delo 15w-40 from Costco is one good way to go. Tom 04 Essex
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Old 05-04-2013, 07:17 PM   #10
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Like above, any major brand diesel CJ-4 oil will serve you well. Rotella, Delvac, or Delo would be my recommendations. I like Delo just because it looks cleaner coming out of the jug, but I'm sure the others are just as good.
I would not recommend synthetic unless you're going to be in very cold climates. Other than a lower viscosity, all synth is really good for is extending the miles before a needed OCI. Most motorhomes time out before they get enough miles for an OCI.
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Old 05-06-2013, 06:25 PM   #11
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I have mine changed at Speedco they use Rotella 15w 40w they do a great job.
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Old 05-06-2013, 07:43 PM   #12
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What ever you decide make sure it is CJ-4 rated. Jim
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