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Old 07-31-2016, 11:48 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, 01:29 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, 01:38 PM   #3
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I belive rotella systhec has rating for gas engines
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Old 07-31-2016, 01:56 PM   #4
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Never used it before, but, Royal Purple might work
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Old 07-31-2016, 03:28 PM   #5
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You should use only the oil recommended by the manufacturer.
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Old 07-31-2016, 03:48 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, 02:30 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, 02:39 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, 02:42 PM   #9
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Amsoil makes full synthetic 15w40
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Old 08-01-2016, 03:00 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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