While it is rumored that Porsche coolant is merely Dex-Cool with a different dye additive, and Dex-Cool meets all the Porsche specs, as has been already said- unless you are doing a full flush, I would not mix coolants. If what you have is pink, top off with pink Porsche stuff.
Now, if what you have is green, that shouldn't be in there and I would get it out with a complete flush. Now, feel free to fill up with a proper mixture of Dex-Cool and distilled water.
There is also some evidence that the G-05 coolant is better stuff, but this has not been proven to be Porsche friendly, and does not mix with others so I would avoid its use.
Depending upon the last time the coolant was flushed, its probably not a bad idea to just flush it all out and then you'll know what its filled with and that its fresh coolant.
Just my $.02
Patrick
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