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Porsche coolant here too. It was hard to pull the trigger at $30/gallon but the only other coolant I felt comfortable with was the Zerex extended life. Thing is, the Zerex was about $18/gallon so at the end of the day, I took the variables out of the equation for and bought the OEM stuff.
So I spent an extra $36 bucks for a fluid that should be in my car for the next 6-8 years.
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