Most cars engines are well built from the factory using very precise machines. It isnt like the old days where you had to break the engines in carefully because of the rough cut engines and metal shavings! Also most car companies test the engines during quality control test before its installed in the car they take them through the rpm's and put them through a small break in period right from the factory! Also as we all know there is 2 way's or opinions on the best way to break it an engine! Drive it like you stole it and or take it easy the first 1,000 miles. Me personally with every new car i buy i take it easy the first 1,000 miles then gradually take it up a notch till the first oil change at around 3 or 4k then after that first oil change i see what she really has!!!! Oh and no matter what the the books say i still change my oil every 4k!