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Originally Posted by urban_legend
If I have a 2001 Boxster and the coolant looks green and not in the pink or yellow family. Then it must have been changed (by previous owner) to a non-porsche coloant.
By color alone, I cannot determine chemical makeup - but probably phosphate free (most are) however likely not silcate free.
Best game plan - have it professional flushed. I have tried twice and can only get about 2 gallons out. So some coolant seems to always remain in the system.
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An '01's coolant would have been green from the factory, they switched to the pink stuff a couple of year later................ It is probably the factory fill. But after 8 years, you should consider changing it.