nberry:
I think you all are getting too anal about break in. Though I agree you should not rev to high RPM's while the engine is cold (FWIW, in the GT3 there is a blue light that extinguishes when the engine is warm) beyond that enjoy the car. Those that wait for a certain miles before engaging the car are wasting their time. It will not make difference concerning the reliability of the car.
No one can point to any evidence that states otherwise.
Give Weissach a call...
This isn't about reliability only but about how well the car will run after 5000-10000 km (performance).
The GT3 RS engine is, according to various sources, very "sensitive" to break-in, similar to the GT3 engine.
So if you want to have maximum reliability combined with maximum performance, you are careful about the break-in period. If this is a lease and you couldn't care less, well...
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RC (Germany) - Rennteam Editor Porsche 991 Carrera 4 GTS Cabriolet, Porsche Macan Turbo, Ford Mustang GT500 Shelby SVT (2014), Jeep Grand Cherokee SRT (2014)