Under extreme pressures and rubbing like the side of a piston molly coatings eventually will wear away
one may ask why bother then?
the molly coating reduces galling and wear of the piston mainly during break in when the cylinder hone is most abrasive
on rod and main bearings less surface abrasion and a more robust hydrodynamic oil wedge and probably less surface speeds vrs piston skirt all leading to a longer coating life on bearings
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