Engine Pistons Rings Set designed for use with 330i, 530i, X3, X5, E46, E36, E39, M54 3.0 models.Constructed from cast iron and heat-resistant alloys, these piston rings offer durability under demanding operating conditions.-engineered to proper sealing within the engine cylinder, they help reduce oil consumption and prevent loss of compression.The set includes all necessary components for a complete piston ring replacement, facilitating straightforward installation.Compatible with OEM numbers 11257506222 and 11257506252, this ring set supports engine performance and efficient. This component is produced by an independent manufacturer.Brand names are used for compatibility illustration.