On Aug 31, 11:02 am, "Jim Burns" wrote:
http://www.lycoming.textron.com/cgi-...=break+in+proc...

A new nitride cylinder will break in fast. Keep your power high, don't baby
it. Straight mineral oil.

Now the A&P is saying that mineral oil is out-dated and that modern
synth oils are better for break in than mineral oil.