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Old 07-14-2017, 10:53 PM   #1
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Default Question About Cummins-Ona 2.8 Generator

I am going to change the oil in my '15 RT 210, and it looks like it takes about 20.1 ounces of oil, or am I reading something wrong. I had an '05 that I used a quart in - so the difference I figure I better ask advice on. Ron
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Old 07-15-2017, 01:25 AM   #2
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The manual says that it takes one quart, that is what I used.
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Old 07-15-2017, 01:35 AM   #3
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Thanks John..I was reading someone's comment - hope they don't go that route! Ron
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Old 07-15-2017, 02:35 AM   #4
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.

IIRC

The new Onan takes less than one quart.

If you pour more than what it requires,
it will spit out in various places,
and the end result won't be pretty.

You better triple check.
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Old 07-15-2017, 02:56 AM   #5
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BBQ...you can bet I will know before pulling the plug to drain. I wonder what is different in the '05 era gens to the, in my case, the '15 models. If the high temps ever go down, then I will be under there. Ron
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Old 07-15-2017, 02:59 AM   #6
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.

The new Onan has a lower profile. It can fit under the chassis frame.

.
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Old 07-15-2017, 03:35 AM   #7
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Clearly the route to go is to follow the manual. Of course check that the manual you have matches the genny model!
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Old 07-15-2017, 06:00 PM   #8
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Add it very slow and check it as you go. It takes little more than half quart(.63). It will blow out any excess and it will be on your parking area.
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Old 07-15-2017, 06:05 PM   #9
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Quote:
Originally Posted by Capt Ron View Post
Add it very slow and check it as you go. It takes little more than half quart. It will blow out any excess and it will be on your parking area.
Are you certain this is safe? I know nothing about these engines, but in some designs over-filling the oil can be dangerous, due to oil in the sump touching moving parts and getting churned up. This introduces air into the oil and reduces the effectiveness of the lubrication. Don't know if this applies here.
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Old 07-15-2017, 07:20 PM   #10
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Read your book on it, mine is a 2.8 and that is what it says . 0.63 quart.
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