1Set Piston Rings Set +0.5 11257506222 11257506252 For 2000-2008 3 5 7 Series X3 X5 Z4 E46 E39 M54 3.0L Piston rings set with +0.50mm oversize dimensions.OE numbers: 11257506222, 11257506252.Designed for use with M54 3.0L engines.Fits models including 3 Series (E46), 5 Series (E39, E60), 7 Series (E65, E66, E67), X3 (E83), X5 (E53), Z3 (E36), and Z4 (E85).Compatible with vehicles from 2000 to 2008.This set includes one complete piston ring set for engine rebuild applications.Installation requires disassembly of the engine block to access the pistons.Proper orientation of rings must follow manufacturer specifications.Lubricate piston skirts and ring grooves before inserting into cylinder bores.ring gaps are staggered during installation.Secure retainer clips in designated piston ring groove locations.Verify cylinder bore dimensions to confirm compatibility with +0.50mm oversize rings.