Coolant for Cummins Onan on 2021 R31

[UVAfisherman]

I noticed the reservoir for my generator was low. It appears to have green coolant in it. According to the manual, I need ethylene glycol coolant that meets ASTM D6221. The kind I found that meets that is red. Can I use that? Have read different things about mixing colors.

And if not, what is the green coolant that Fluid Motion uses?

Thanks in advance!

 

[bradf]

We also have a 2021 R-31. I don't recall what coolant is in the generator and haven't yet had the need to add any. I've been told to use the Cummins Blue Pre-Mix coolant. I generally stick with the manufacturer's product to eliminate any guesswork or quality issues (I use Volva Penta VCS pre-mix for the engine).

Not sure it's a good idea to mix different types of coolant. Interested to know what Fluid Motion uses if it's anything other than the Cummins brand.

 

[bradf]

Just added coolant to my Onan for the first time. Ordered the Cummins recommended Fleetguard ES Compleat EG 50/50 Premix (aka "Cummins Blue"). According to the product literature the coolant can be mixed with other brands, provided they comply with ASTM D6210. The coolant that was in the Onan was blue so I'm guessing the dealer used the same product. Don't like the idea of mixing coolants so I think I will stick with that.