I have just checked the strength of the Anti-freeze on my wifes petrol A3, and found that it is low, and has reduced over time.
The car is 4 years old, and the coolant has never needed topping up.
Audi say the system is sealed for life, which I dont believe as extended life coolant should be changed every 5 years (Orange)
Does anyone know the spec for Audi antifreeze please?