Originally Posted by GmanMD

Thanks for the advice guys. As to whether Porsche or others are more qualified to make recommendations, I will have to take all these recommendations with a grain of salt. As most people do not believe Porsche in their oil change interval, I think the same mentality may be true on soft break-ins. A lot dogma that is in place today is based on experiences from many years ago and ideas which were valid for that technology may not be true today, but is perpetuated because that is the way things were done for so many years. Also, I would like to know where the 4200rpm limit originated from and how that magical number will somehow decrease engine wear as compared to a limit of 5000rpm, or why not limit to 3800rpm to decrease wear even more? I don't claim to know what is right or wrong as to how to break an engine in, but I do think that these long-standing traditions need to be reevaluated every so often to see if they are still valid or merely relics of years long passed.