From Pelicanparts: " Plan on using about 19 liters (5 gallons) of coolant for cars without a center radiator (all 1997-04 Boxster). The 2005-08 cars and the Boxster S take about 22 liters (6 gallons) of coolant. Add one more liter as well if you have an automatic transmission. If ordering coolant for your flush job, I would be sure to order an extra gallon: you might need them to top off down the road, and the Porsche OEM coolant can be difficult to find in a pinch"
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