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Joe,
There is no reason to use anything other than the Porsche coolant. It's not that expensive. You can get a liter bottle of it for about $12 at the dealer. Just keep it at home for those times when you need to top up the system.
Use distilled water to dilute the coolant (always use distilled as whatever your local water authority puts in the water supply can create chalky deposits in the cooling system, especially the radiators choking them up, this is especially true if there is a lot of minerals in your local water).
m
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