A website recommends hard acceleration and deceleration for the first 20 miles followed buy an oil change. The reason give is "that gas pressure from hard acceleration forces the rings to contact the cylinder around their entire circumference, which is the only way the rings can properly wear into the exact shape of the cylinder to seal the combustion pressure."

It also claims that if you follow the factory's break-in recommendation, you can lose 2-10% power.

Is this how you would break-in your new Challenger?

The website address is:

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