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For me, things are simple: Qualification and motive. Porsche engineers are by far the most qualified to give break-in recommendations about Porsches, and those are summed up in the manual. The only thing that would prevent me from listening to those recommendations would be lack of honesty on their part i.e. if Porsche would somehow benefit from giving me the wrong advice. It's in Porsche's interest to minimize its warranty costs, which is aligned with my interest in having a trouble free ownership. Since our interests are aligned, I have no reason to question their honesty. Hence, I follow the recommended break-in procedure.
Btw, salespeople both lack the qualification AND have questionable motives. It's difficult for a salesperson to recommend the proper break-in procedure to a potential buyer who just flogged that "demo" at 6rpms during the test drive. He wouldn't be selling THAT demo to THAT customer for sure.
Z.
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