Quote:
Originally Posted by Mauricio Palacios. MD
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Principles aligned with these are shared among all engine builders, tuners, shops, etc. Exact procedure will vary, especially considering you're not going to have one uniform break-in procedure for different types of engines for different purposes, but the ideology is agreed upon unanimously by anyone who is knowledgeable.
It's also agreed upon that keeping it "below x RPM and x MPH for x miles" as the only guideline, per any owner's manual, is the worst possible way to break an engine in. However, you won't find an auto manfucturer stray away from this. Good luck getting legal to approve outlining proper break-in in a mass-market car's owner's manual, so having something in there to appease those who think they're accomplishing something does just fine. The bit about "taking it easy" on the brakes for x miles is the best, though. Again, the liability of some dweeby putz causing an accident following brake-bedding procedure is too high.
But does it really make a difference? No...not in the least bit for mass produced cars like these.