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Yes. I don't know where the "life time" coolant claims come from, but all coolants show degradation over time, Porsche's included. We normally suggest coolant changes at 5 years or whenever the coolant tests poorly (cloudy, pH swings, freeze point changes, etc.).
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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