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Hey I had the same identical problem. If you got coolant in your oil, sometimes the oil cooler leaks giving the appearance of a blown head. After I replaced my oil cooler, I got up to 230+ on the way home. Next morning I filled the coolant tank the PROPER way as illustrated in the mechanics manual. You have to open the bleed valve run the engine and blip the throttle to get the air out. After that no more problems. Boxster doesn't do too good in 100+ heat. I live in AZ and was thinking of refitting the s middle radiator. I also put a bottle of cool wetter in my radiator.
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