My tractor came from factory assembly plant in NC with ASTM D5216 which is a propylene-based antifreeze that requires the use of a special ball tester to check its freezing point. A standard antifreeze hydrometer will not give correct reading with this type of antifreeze. After speaking with technical services at Peak , I decided to flush my coolant syste and replace it with Peak final charge. Having a parent bore engine this antifreeze was a good fit , I'm sure many other brands would be comparable ,even the old IAT green antifreeze if you change it ever two to three years..just be cautious of coolant containing 2EH acid ..it can negatively affect waterpump seals,gaskets and hoses
