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My understanding is that mixing coolant types was a bigger deal back when the 986 was a new car, and there were multiple (and not necessarily compatible) formulas out there. Now, they're mostly the same. But if your coolant is original, it's probably time for a flush anyway.
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'99 986 Ocean Blue Metallic
'87 924S, winter beater
'17 VW Golf Sportwagen, for when I need extra seats
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