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Any information on which anti-freezes are recommended and which should be avoided. I have an RS6, i.e. ally head. I believe some anti-freezes can be corrosive to aluminium. Also the handbook states to replace every 2 years. Presumably this is as the anti-freeze deteriorates over time and not because of anything else. Halfords do a 5-year anti-freeze. Can this be used?

I wold stick to the original Audi antifreeze. Good quality, and no worries on whether its correct or not.

We only use g12+ from audi...

OK thanks guys! Best to play safe. Many thanks.