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PG/EG Antifreeze Calculator

Use this calculator to quickly determine the approximate amount of Glycol and Deionized water to use in your system.


Calculations are intended to provide an estimate and should not be solely relied upon. The fluid should always be tested with a glycol refractometer to verify freeze protection. 

Fluid remaining in the system after cleaning and flushing can dilute newly added glycol. Therefore, it is recommended that 5-10% more glycol be added than required to allow for dilution.