ditto; if you are doing it yourself, dropping the $20 bucks max for new coolant (there are several non-porsche brands that will work) is well worth it. even paying someone to do it would be worth it, but it's really not hard at all if you've got a floor jack/stands. I, too, just bought a boxster with an unknown service history, so I've changed the oil, coolant, and other sundries to avoid any problems down the road.
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