The Porsche coolant is 50% coolant / 50% distilled water so you won't be using the entire bottle. If you have never added coolant I would use the Porsche stuff, unless you know what is in the car already, then use that. MIxing coolants can be very bad, in which case you may want to flush the system.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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