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The Groom said:
I would definitely stick to the manual. You don't want the dealership to deny warrantee coverage on the engine, on grounds that you didn't respect the break-in period.
It's slimy, but that exactly the kind of cop-out that you can expect from many car dealers...
That would never happen.... Besides, whadaya think they do with the demo models?? Those cars get beaten hard right out of the box, BY THE DEALERS.. I remember my first test drive, the car had 48 miles on it, and the sales manager and me went out and absolutely gave it hell, redline shifts at every opportunity... That demo car got sold to a local contractor, and was in for it's 2nd service under warranty last time I was at my dealer... no problems, other than the owner takes crappy care of it, really dirty...
The manual is the factory's general "break-in-for-dummies" routine, keeping it simple and briefly-worded and overkill-term so that hopefully ON AVERAGE, real-life, they keep abject abuse to a minimum to protect their warranty liability. It's not something you need to follow as gospel (unless you're not terribly understanding of things mechanical, and fear the unknown..), as the wording and mileage and procedure seems to differ in the manuals from country to country, language to language. In other words, guys in suits in varying parts of the world in charge of different vast "territories" are affecting what the break-in procedure is for their territory. As I understand it, some Porsche manuals in certain areas of the world don't even SPECIFY an rpm limit for break-in...
Just be smart. Warm her up well, vary rpms early-on, and keep it reasonable for the first thou'. A blip into the high-side of the tach here or there isn't going to spell doom for your engine, just don't make it an every-stoplight routine. Realize that actual physical break-in of your engine internals happens on a sharply declining curve, meaning that 80% of the physical wear and seating occurs in the first 10-20% of your specified "period". It's not a flat line. And it's certainly not a scenario where at 1,900 miles your engine is "not" broken in, and at 2,100 miles it magically "is". It's just easier and more practical for Porsche to tell you 2,000 miles at blah-blah rpm, rather than try to instruct all their customers, many of which probably don't know a rod bearing from a fishing rod, on metallurgy and heat cycles.