I am curious about the break in for these babies. I have been told that today's cars don't need to be broken in like the older cars because this is done at the factory. I have been hearing different people saying they are cautious during the break in. First, what is the brake in period (miles), and second, what are the rules for the break in? Also, I see some of you are changing your oil within the first 500-1000 miles. I didn't think you needed to do this as often because of the Mobil 1 synthetic oil. I want to do it right and there are conflicting opinions.