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I apologize for the not recalling all the terms names but basically GM was the developer of this sort of coolant called Dexcool (?). Early on it had big problems with gelling. It's come a long way, sorted that out. Basically what Porsche has is devoid of corrosive Silica and phosphates. Thats what Dexcool is. Everybody does a version of it. Some manufactures like Zerox(? something like that) spec a version of dexcool for Porsche.
Again, my exact terminology and brand names are messed up but a bit do some research on GM coolant (remember, google is you best friend) and you'll wind up with what you need to know to make a decision.
Regards, Pk
BTW: My car has had it for 8 yrs (albeit not many miles) and it's fine.
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