Straight answers to simple questions;
Use Mobil 1 in a temperature appropriate weight for your location
Change the coolant every 3 -5 years (or whenever you change the water pump) and use the Porsche OEM coolant.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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