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Not as a qualified recommendation, but what I do with a long line of Porsche, VW, Audi cars; If they come to me with Factory stuff, I keep it going until I have reason for a full refill. For a refill I use an OAT, Long Life type coolant without care for a particular brand. I do not mix different products.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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