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Old 03-05-2015, 07:13 PM   #11
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Coot,
That would be fine if you don't change your oil very often. I always change it once a year (drive less than 10k miles/year) so I feel that regular dino oil is fine.
I change oil & filter @ 15,000 or once a year whichever is the longest, usually before making any long trip like FL.
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Old 03-05-2015, 07:36 PM   #12
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Oil Olay!

Better be using the European blend of Mobil 1 (the official oil of...) in a
Mercedes Blu Tech 3.0 V6 diesel, period! No choice here so every season
I will be spending around $110 (dyi only!) for 12 ltr. of this stuff, plus filter,
for my '11 Solera. Gen set will get the American Mobil 1 for added
insurance, plus filter at recco'd intervals. * * sigh.,.,.,.,.,**

PS: Love that '55 Chev!!
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Old 03-06-2015, 03:21 PM   #13
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Hey boowho! You are getting a lot of responses, but for what engine type; most do not say. I believe that you want responses for a Cummins Diesel. There are distinct oils for diesel, like Shell Rotella or Valvoline Diesel Blue what most seem to use. Valvoline Diesel Blue also comes in a synthetic.
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Old 03-06-2015, 03:27 PM   #14
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I use Mobile 1 Del vac in every engine I own (diesel and gas), including my Yamaha gennys!
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Old 03-06-2015, 06:04 PM   #15
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Originally Posted by I-RV View Post
Hey boowho! You are getting a lot of responses, but for what engine type; most do not say. I believe that you want responses for a Cummins Diesel. There are distinct oils for diesel, like Shell Rotella or Valvoline Diesel Blue what most seem to use. Valvoline Diesel Blue also comes in a synthetic.
Thanks, Hank.... I forgot that many NON-Berkshire owners read this forum, so figured I would only be getting answers from Berk owners.

I figure on the Rotella. Synthetic (of any brand) is better, but also (I think) more expensive.

Cummins says it's OK too use synthetic, but NOT to extend the change interval (as you can do with most cars using synthetic).

Since I have to change annually (no matter what) I figure a good high quality regular oil (that meets Cummins specs) will be fine. YMMV.

Boowho??
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Old 03-06-2015, 06:32 PM   #16
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I let the dealer change mine so it is what ever Ford is selling at the time.
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Old 03-06-2015, 06:53 PM   #17
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I've been using Valvoline since the 70's. I also use Valvoline Premiun Blue SAE 15W40 rating in the Berkshire as specified in the Cummins manual.
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Old 03-06-2015, 07:01 PM   #18
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Rotella, and change every 5000 miles with filter and two fuel filters every other oil change.
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Old 03-06-2015, 09:38 PM   #19
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I work with a former Cummins test engineer who did a lot of their EPA testing. I called him as soon as I needed my first oil change and asked him what Cummins actually uses. His answer was that they had an alliance with Valvoline and they did all of their testing with it. Then he proceeded to tell me that as long as the oil meets the API spec, they are compatible and the engine would meet its B20 design life.
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Old 03-07-2015, 01:42 AM   #20
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Rotella T6 5w40 in the blue jug @ Walmart. Right now it's on sale. Intervals every 200 hours or 7,000 miles (5000 miles if towing alot) whichever comes first.
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