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Just received an updated response from Castrol.

I had hoped to find an oil like those in 5w30. The 5 gallon pails would not be a problem since it takes 3 gallons each oil change. For some reason Generac recommends SN or newer spec rather than any oil made specifically for natural gas engines.

Response from Castrol.

It must be different recommendations for air cooled. The viscosity chart from my manual shown above has only 5w30 for all temperatures. I also contacted Amsoil, Valvoline, and Royal Purple tech. RP said they do not recommend any of their oil for natural gas engines. Amsoil said only their OE oil...

Here is the relevant page from my owners manual. This is a relatively large 48kw generator with a 3 gallon oil capacity. Contacting Generac tech support, they emphasized the low ash requirement and 5w30.

Yes I had considered that oil but Generac said considering winter in Wisconsin not to go beyond 5w30.

No it does not.

I have a 4.5 liter 4 cylinder water cooled engine running natural gas in a Generac generator. I was considering AMSOIL Signature Series but Amsoil tech department said I should use the OE because it is low ash and the SS is not. Even though the manual does not mention a low ash requirement, I...

I have been researching to find the best oil for my generator and have some info. Fuchs GT Flex C23 5W30 includes recommendations for natural gas engines as well as Mercedes 229.51 and 229.52. According to Generac tech support, the natural gas engines require low ash oil and additives to...