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      03-31-2006, 12:54 PM   #9
Car Guy

Drives: 330i
Join Date: Mar 2006
Location: Wisconsin

iTrader: (0)

The real deal on engine break-in . .

Here is the best information I have found so far on breaking in an engine. Read the long post towards the bottom; especially the technical section:

From the article:

The Theory. The primary goals of engine break-in are: 1) achieving a
good seal between the piston rings and cylinder walls, and 2) allowing
the engine to operate correctly throughout its RPM range. The major
enemy during the break-in period is localized heat buildup, mainly in
bearing surfaces (most notably the crankshaft bearings).

It's a good read!