This 6-piece piston ring set is designed for vehicles equipped with the N52B30 3.0L naturally aspirated inline-6 engine (2996cc) and features a 9.3:1 compression ratio.It is compatible with E87, E90, E92, E60, and E61 chassis, including 130i, 330i, and 530i models.The set is engineered to meet standard replacement specifications and supports efficient combustion and engine.Constructed from materials, it is suitable for engine rebuilding and maintenance where OEM-equivalent components are required.Proper installation ensures correct fitment and function.This product replaces part numbers 11257564335 and 11257559434.