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      07-31-2012, 05:53 PM   #10
ReturnZero
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Drives: 2013 X3 35i M-Sport
Join Date: May 2012
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You're basically dealing with different resonating frequencies. When things are first getting broken in you want the frequencies at which these break-in processes happen to vary so everything is nice and even at all frequencies, instead of "grooving" to a specific frequency. To vary the frequencies, you vary the RPM.

You also want to vary the load on the engine, and varying the RPM helps with this as well.
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