4pcs Engine Piston Ring Set 11257618811 11258606459 11257640166 For 328i 428i 528i X3 F30 F10 N20B20A 2.0T This piston ring set includes four rings designed to fit specific engine models.The part numbers are 11257618811, 11258606459, and 11257640166.It is compatible with vehicles equipped with the N20B20A 2.0L turbo engine, including certain models designated as 328i, 428i, 528i, and X3, produced under chassis codes F30 and F10.The set is intended for use during engine rebuilds or maintenance to restore proper compression and oil control.Each ring is manufactured to match specifications for fit and function. This is a non- replacement.Any reference to brand names or models is strictly for compatibility purposes.