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Walter,
Mineral oil may be an "old wives tale" but it is a
very popular one and is still called for by Lycoming and Mattituck - the shop
that did my work.
Break in can be also thought of as "wear in".
Modern multi oils work much better for reducing wear - maybe too
well.
What you are really trying to accomplish is to
smooth up the cylinder walls to a "just right" surface finish and
fit.
A lot can go wrong with this process and the list
of variables is huge.
A short break in may get the fit worn in past the
point where a tight engine is producing excess heat but that may not be where
oil consumption is minimal and compression is maximum.
Most people here leave the mineral oil in for the
first 50 hours.
Mark Ravinski
N360 KB
http://www.lycoming.textron.com/main.jsp?bodyPage=/support/publications/keyReprints/operation/engineBreakIn.html
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