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re the water pump, there is nothing in the porsche maintenance schedule that i could find about replacing the water pump (inspect yes, replace no).
what some folks are finding is that the plastic impeller is starting to deteriorate and send small bits of plastic through the cooling system, which blocks important passages and can restrict cooling to important places. given that it is a plastic deterioration issue, wear is tied more to age than mileage. as such, jake raby is recommending replacement every three years to preempt this failure mode.
this is also talk about moving to metal impellers (some non-oem replacement pumps have metal impellers) but apparently the concern is that, if there is a bearing failure, that impeller can chew-up the engine.
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