The antifreeze isn't a matter of having to use Porsche brand (although some will insist you do), it's a matter of using a phosphate-free antifreeze. Your garden variety brands contain phosphates and if you add it to a system that requires phosphate-free antifreeze you will generate a nice gell in your system that will halt any flow. Many European cars, not just Porsches, require phosphate-free anitfreeze.
Also be aware there are early and late types of phosphate-free antifreeze for European cars. Zerez makes a brand in a gold bottle (I think it's called M30) that is designed for Porsches up to 1995. Obviously that won't work with your Box.
Haveline Extended Life (Dex-Cool) antifreeze will do the job.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
1987 928 S4 - Granite Green Metallic (Felsengrun)
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