[sdorn]

The manual says to vary engine speed for the first 1,200 miles. Also, keep the revs below 4500 and the speed under 100mph.

I have also read some interesting articles that seem to indicate that driving a car delicately during the break-in period leads to lower performance, and that driving the car extremely hard during breakin is actually more conducive to the car having better performance.

I had a custom built motor put in my Mustang, and the engine builder actually broke the engine in on the dyno doing complete runs to the redline. He started off pulling up to lower rpms, then worked his way up to doing several redline runs. That car runs like a champ, although I have only put another 12,000 miles on it since the new engine went in.