I just changed mine - car has only 27K miles - but is 13 years old. While I was doing that, I figured I'd replace the water pump and thermostat. (Relatively) cheap insurance... and I just didn't trust 13 year old coolant.
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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