sorry to hear about your problem.
I wonder if I got lucky when I noticed a coolant leak.
http://forums.pelicanparts.com/porsche-996-997-forum/716942-coolant-top-right-cyl-bank.html?highlight=oil%2Fwater
What would have to be done to clean the water out of the engine?
Let us know what you find.
Good Luck, I hope the tab isn't to high