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Regarding the factory run-in of the motors Yes, Porsche runs every motor on an engine dyno prior to installing it in a car. As for the number of miles, that's unknown but they do run it through a computerized "break-in" then make power pulls to confirm output. The oil is then drained and replenished when it's finally installed in a car.
That would pretty much eliminate the need for a 1000 mile oil change.
BTW, if a motor doesn't make it's spec rated HP it's torn down to analyze why. Because of this continuing analysis they have very few motors that don't make the grade.
Here's a quote directly from the Porsche website:
The following hot test is the final step in the engine production process. The engines are first of all heated up to operating temperature and then subjected to a functional test including full-throttle testing. Information in the form of up to 220 parameters is generated in this test of around five minutes' duration.
This ensures that Porsche's high quality standards are also met in the area of engine construction.
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