Did you rebuild it? Hmm, what to do for break-in?

http://www.mototuneusa.com/break_in_secrets.htm

Taboo posted a more in-depth version of the "WOT break-in" on DSMtalk, but I am too lazy to dig it up. The basic principle is to let the car start and idle for 20 minutes or so to get air out of lifters, check for oil and coolant leaks, etc., change the oil, then go out and do WOT 3rd gear runs up to near redline then let the engine wind down on its own, repeat a few times then drive back home, change the oil and drive it like you normally would. This only applies if you did a full rebuild, new rings, honed the cylinders, etc.