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Old 07-31-2016, 10:48 AM   #1
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synthetic oil for onan generator

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
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Old 07-31-2016, 12:29 PM   #2
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I have used Castrol Edge full synthetic in 5W30 viscosity in my 2 Honda generators and my lawn mower for at least 6 years. My Hondas are 10 years old and still purr like new. My temp range is about the same as yours.
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Old 07-31-2016, 12:38 PM   #3
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I belive rotella systhec has rating for gas engines
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Old 07-31-2016, 12:56 PM   #4
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Never used it before, but, Royal Purple might work
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Old 07-31-2016, 02:28 PM   #5
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You should use only the oil recommended by the manufacturer.
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Old 07-31-2016, 02:48 PM   #6
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Quote:
Originally Posted by ilmor View Post
You should use only the oil recommended by the manufacturer.
Why? If the oil has the same specifications as the recommended I'd rather not support the manufacturers partner just because.
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Old 08-01-2016, 01:30 PM   #7
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Shell TD6 available at Walmart. Used in a lot of diesel motors but also used in gas motors. I also use it in my Can Am ATV.
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Old 08-01-2016, 01:39 PM   #8
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Looked at my jug of shell Rotella T6 and noticed it is 5/40 weight.
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Old 08-01-2016, 01:42 PM   #9
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Amsoil makes full synthetic 15w40
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Old 08-01-2016, 02:00 PM   #10
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So does Schaeffers oil. Whatever you choose... make it one you can find anywhere cause you never know when you will need it. I also HIGHLY recommend it meets or exceeds OEM specs.
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Old 08-01-2016, 02:01 PM   #11
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Quote:
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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Quote:
Originally Posted by Springerdad View Post
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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