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thstone · 05-27-2017, 01:29 PM

The risk is whether the previous owner had fully flushed out the OEM coolant before re-filling with Prestone. If so, then there isn't any likely damage. But you will have to do a full flush (maybe two) to get all of the Prestone out before re-filling with the OEM coolant. This is because the Porsche OEM coolant isn't compatible with aftermarket coolants like Prestone.

Also, there is a chance that the green coolant was OEM. Porsche used green OEM coolant up until around 2005 and then switched over to the pink stuff. If the coolant in your car hadn't ever been changed (some owners believe that the coolant is lifetime and never has to be changed) there is a chance that it still had the green OEM coolant in it.

Bottom line: Flush out the green coolant completely and then re-fill with the pink OEM and you should be good to go with no worries.

05-27-2017, 01:29 PM	#2
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	The risk is whether the previous owner had fully flushed out the OEM coolant before re-filling with Prestone. If so, then there isn't any likely damage. But you will have to do a full flush (maybe two) to get all of the Prestone out before re-filling with the OEM coolant. This is because the Porsche OEM coolant isn't compatible with aftermarket coolants like Prestone. Also, there is a chance that the green coolant was OEM. Porsche used green OEM coolant up until around 2005 and then switched over to the pink stuff. If the coolant in your car hadn't ever been changed (some owners believe that the coolant is lifetime and never has to be changed) there is a chance that it still had the green OEM coolant in it. Bottom line: Flush out the green coolant completely and then re-fill with the pink OEM and you should be good to go with no worries. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 05-27-2017 at 01:32 PM.