just to let you know, engines do come "broken in" from the factory...all the cars follow a break in procedure when engines are belt, this is necesary to correctly seat the rings against the cylinder walls...however, a lot of people reccomend at least 500 miles on the motor before starting to drive it hard...however, it all depends on what you want out of your motor...there are multiple theories about how a motor should be broken in...but really, after it has been driven 20 miles there is not much you can do that will make a real difference(within 20 miles is when the rings are still in the process of seating)...and since I am sure it already has 20 on it...just wait till after 500