Diesel engine pistons usually require replacement or reconditioning at fairly regular intervals even if the engine is operated under near-ideal conditions. Their service life is limited because they are mechanically and thermally highly loaded components and over time they will suffer from excessive wear of the piston ring grooves and/or hot corrosion at the piston top surface.
Depending on the condition of a given piston, QuantiServ recommends either full or partial reconditioning.