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Mixture Ratio

WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, 2016 Volkswagen Jetta, and 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

Use distilled water for mixing. Tap or well water do not have the necessary quality to assure the functionality of the coolant.

Freeze protection to Coolant Additive Ratio Water (1)
-25 °C (-13 °F) approximately 40 % approximately 60 %
-35 °C (-31 °F) approximately 50 % approximately 50 %
-40 °C (-40 °F) approximately 60 % approximately 40 %
(1) Use distilled water only.