I often wonder about this. Car manufactures don't have break-in stations placed within an assembly line or a cadre of factory workers that take every vehicle to a track to bed in brake pads before shipping. No new car manufacture has you come back after 300 miles to change out your break-in oil. Now, having said that. I do believe that if you are optimizing a vehicle for a higher level of performance, or a manufacture has a specific break-in procedure. Then yes, worry about it. But on average. Nope. Put it together and break it in just like your daily driving habits. Snake oils and witchcraft be damned.