Cummins Onan 8K Gen

[46490]

Can anyone tell me what coolant is used in the Generator - it is blue in color. I called Cummins and they said the gens are shipped dry to Freight-liner, called Freight-liner and they said that they shipped the chassis dry to Winnebago, called Winnebago and they said they use blue coolant that turns green and they don't know who makes it. I think it may be PEAK anti-freeze, just want to have some in case I would need it. I have extra Pres-tone for the engine and it's green and I don't know if it can be mixed.

[fagnaml]

From my Refining / Petchem manufacturing experience I can say that different color coolants should no be mixed because the additives packages used in each coolant may not be compatible when mixed together. There are three primary colors of coolants:

• Neon Green -- "original" Prestone coolant
• Red-Orange - Dex-cool for GM vehicles
• Blue -- Coolants for Honda and now Toyota and other foreign vehicles

Each of these coolants start with clear color ethylene glycol. Then each manufacture adds their own proprietary additives (corrosion inhibitors, oxygen scavangers, etc.) and their own color dye. Dex-cool coolants from Prestone, Peak, and other manufactures can be mixed as the Dex-cool specifications "dictate" the corrosion additives. Similar for the neon green color i.e. neo green coolants from various manufactures can be mixed.

Dex-cool orange and neo green standard should not be mixed.

[gatorcq]

First, this forum is for Cummiins Diesel Engines and not the generator Variety.

So this would/should be in the tech section. But, look at the color of your coolant and go from.

[mackwrench]

If the Coolant is "blue" that's what you should use when topping off.
Do not add the "green" not compatible.

However, the blue is available at any big box AutoZone, NAPA or the like, maybe even Walmart.
As posted above, Most Honda, Toyota use it.
It's long life coolant.

BTW...does coach engine have blue in it as well?

[JC2]

The coolant in our Cummins gen has always been the same as what is/was in the big engine.

[46490]

Originally Posted by gatorcq

First, this forum is for Cummiins Diesel Engines and not the generator Variety.

So this would/should be in the tech section. But, look at the color of your coolant and go from.

This section is called Cummins and since the Onan generator is made by Cummins then this is the place for the post. Maybe the section should be titled "Cummins Diesel Engines and not the generator Variety".IMHO

[46490]

Originally Posted by mackwrench

If the Coolant is "blue" that's what you should use when topping off.
Do not add the "green" not compatible.

However, the blue is available at any big box AutoZone, NAPA or the like, maybe even Walmart.
As posted above, Most Honda, Toyota use it.
It's long life coolant.

BTW...does coach engine have blue in it as well?

Who makes the blue anti-freeze? BTW the coach anti-freeze is green.

[mackwrench]

Several mfg make blue HOAT coolant. Stop by auto box parts store, theyll have some....long as it's diesel engine rated , ....I am around a fleet of Cummins Westport natural gas powered school buses daily and they all use it.

What's strange is I don't think that genset came factory filled with blue long life coolant....but maybe it did....do you have any service records showing it was flushed/changed?
But if you're sure that's what in it,
https://www.amazon.com/dp/B077NT2YD7/ref=emc_b_5_mob_t

[Happycarz]

Fleetguard ES Compleat EG is clear blue, not translucent like most coolants. It has been around for years and It is not an OAT coolant.

https://www.cumminsfiltration.com/si...es/LT15070.pdf