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2012 Forester X 5 MT
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Using a 15 micron engine vs 40 micron reduces extend engine wear by two and a half times...
I've read this too.

With the engine running, the oil film under the rings is a few microns - so more dirt there equals more wear.

The oil film in the bearings is much thicker - 10's of microns so most of the wear there probably occurs during start-up.
 
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