There is a power break in procedure described on
www.mototuneusa.com , I have done this specific procedure to a 2001 MB E320, 2002 NSX, Kawasaki ZX-6 and because I bought my boxster used, I wasn't able to power break in my boxster. All it really involves is warming up your car properly, I'm anal so I did it for 15-20 minutes. then ride it in hard according to the specifics described on the website. The car's engines run like brand new to this day, Oil changes are super clean, and what can I tell you, when my uncle drives my e320, he says mine is faster than his. (we both bought our E320 4 matics at the same time). Afther the first 10 miles, you HAVE to change your oil. then anal me changed it again at 200 then 1000. I"m just being overly cautious that's all. Check out the website, you won't regret it.