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Hi,
Oil in the Coolant has been covered pretty well. One thing to do is a leakdown test of each cylinder and mark the results, this will tell you more of what's going on. Likewise, a Coolant Pressure Test will also help. If the Cooling System fails to hold pressure, then it leaking somewhere. If no visible leaks are found, then one must suspect the HG.
But, I'm wondering more if two incompatable Coolants weren't mixed? The Porsche uses a Phosphate-free Coolant, like Sierra or Prestone 5/150. If mixed with Phosphated Coolant, the two chemically react and form a Gel like substance which could also be emulsion-like.
Do the headgasket tests and if nothing is revealed, then suspect this unless you know that the possibility exists that there was a coolant mix. Hope this helps...
Happy Motoring!... Jim'99
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