[old_skul]

My buddy got his engine back from the mechanic after a rebuild. The engine break-in done by the mechanic was a lot different than most I've heard about.

For instance, on startup, I thought you were supposed to run the engine at 2200 RPM for 20 minutes, shut down, change the oil, and then restart and keep it between 2000 and 4500 RPM until 1000 miles. Other rituals I've heard involve 2000 RPM for 20 minutes, and then 3000 RPM for 10 minutes, along with a few other levels of revs for periods of time....it's all confusing.

What have you heard is the proper procedure?

(Disclaimer: the mechanic in question is a Porsche industry veteran and worked decades in a Porsche dealership and is a certified Porsche master mechanic. I don't doubt his wisdom.)