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I can see how my engine's cylinder walls, while appearing to be perfectly smooth and unscratched, are actually not glass-smooth...but more of a "satin-finish" smooth - and that this very slight texture would be a perfect medium to break in new rings over a period of time...more quickly at first and then more slowly, until they achieve something very close a stable, almost non-wearing state...and can then remain like this for quite a long time, at least to the extent that they are appropriately stressed. Make sense?
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