Which coolant to use in Audi A4?
Which Coolant to Use in an Audi A4 For most modern Audi A4 models, you should use a VW/Audi-approved G12++ or G13 coolant (now typically labeled as VW TL 774 G/J or equivalent), always mixed with distilled water to about a 50:50 ratio, and never mix it with generic green or unknown coolant types. This …
