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Old 08-01-2016, 02:01 PM   #11
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Originally Posted by CHICKDOE View Post
I've looked at past posts and there seems to be many being that recommend using synthetic oil in the generator. I have an onan 5500 lp generator and it's time to change the oil. based upon the temperatures where we live (below freezing to over 100) the recommendation is to use 15w-40 oil. so I tried to find a brand of synthetic oil in this viscosity. I couldn't find any. all the ones that are 15w-40 are for cj service (diesel engines). so my question is what are people using? (brand, viscosity, gas or diesel, and is what they are using the same as what is recommended?

thanks

The rotella will work just fine . 15/40 or even 5 /40 is ok once the oil is warm the viscosity increases to the 40 wt . the 5 wt is good for flow when it's cold but won't make a difference if it's 90 out
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Old 08-01-2016, 06:31 PM   #12
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Never used it before, but, Royal Purple might work
With respect... if you have never used it before why would you recommend it over any other oil? Why recommend something you've never even tried?

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Old 08-01-2016, 06:56 PM   #13
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With respect... if you have never used it before why would you recommend it over any other oil? Why recommend something you've never even tried?

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Well, bbrown thought the op was asking for recommendations. I personally use Amsoil for everything, but know of people that have used Royal Purple for their gennys. I would have mentioned Amsoil but lot of people dont know where to get it.
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Old 08-01-2016, 07:18 PM   #14
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Amsoil. Its on the web. Its WAY to easy to buy. I'm a dealer. Go online. Set up a personal account and buy. Amsoil is THE first synthetic oil. And, in my opinion, the best.
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Old 08-02-2016, 07:54 AM   #15
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Is there a such thing as straight 30w syn.? Cummins Onen recommends 30w is best at temps similar to our summer temps.
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Old 08-02-2016, 07:55 AM   #16
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Is there a such thing as straight 30w syn.? Cummins Onen recommends 30w is best at temps similar to our summer temps.
There is. Amsoil offers that too.
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Old 08-02-2016, 08:13 AM   #17
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Amsoil. Its on the web. Its WAY to easy to buy. I'm a dealer. Go online. Set up a personal account and buy. Amsoil is THE first synthetic oil. And, in my opinion, the best.
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Old 08-02-2016, 01:00 PM   #18
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I used Wal-Mart 10-30 synthetic in my last unit for 8 years/600 hours no issues.
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Old 08-03-2016, 07:38 PM   #19
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Question reg or synthetic

I went to Cummins to buy oil for my Onan diesel generator 3200, in my MBS 2401R Forrester. I asked for synthetic but was told by the service and parts departments to only use regular oil. So I have only been using regular. I don't know why but the Cummins folks said that they would not recommend using synthetic in their generators. Got me?
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Old 08-03-2016, 08:02 PM   #20
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Something doesn't sound right about all that. What does your Onan manual tell you to use?
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