OAT ad NOAT

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It's a small Case tractor, don't know what brand engine.

Owner's manual refers to a Case product or the ASTM3306 spec. There is a sticker saying it's an extended life coolant installed.

Are all organic based coolants that are ELC nitrated?

Just trying to figure out what is in there and what is compatible for the occasional top-up of the surge tank.
 
Most OAT and HOAT coolants can be safely mixed, all you're doing is reducing the amount of the Inorganic inhibitor, be it Silicate, Nitrate, Phospate etc and increasing the amount of OAT inhibitors.
 
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