Your local parts store has many different brands but the fact is that anti-freeze is anti-freeze. You should test your coolant to make sure that the mixture is good. If it is you can buy any 50/50 mixture from your parts store to add to your system. If the mixture is weak you should go with the full strength coolant to get yours up to about a 50/50 mixture. You can buy a tester at the parts store for a few bucks. Just make sure that you test it when the engine is cool!
You need to use vw/audi coolant. Go to either a Volkswagen or Audi dealership. IT's not cheap and comes as a concentrate (dilute 50/50), but you run the risk of growing cottage-cheese-like clumps in your cooling system if you mix a different type of coolant.
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