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Not knowing when the last time, if ever, the coolant was changed on my 99, or what the heck is even in there, I plan on doing a full flush and change in the spring. I've read a few people using Valvoline DEX COOL, so just for fun I called Valvoline this morning. The CS Tech told me that DEX COOl is indeed the correct formula for the car, and even claimed they actually make it for Porsche.
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Defectfully
Patrick
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