OEM number: 2730301517 Material: Aluminum Compatibility: GL550, E500, S550, W212, W221, and other models equipped with 5.5 V8 M273 engines Design: Specifically engineered for M273 5.5 V8 engines Performance: Features low volatile content at 105℃, contributing to stable engine Includes: 8pcs M273 piston rings set The 8pcs M273 engine piston rings set is designed for use in vehicles powered by the 5.5 V8 M273 engine.Constructed from aluminum, the rings are built to support performance and extended service life.With OEM specification 2730301517, this set fitment for a range of compatible models including GL550, E500, S550, W212, and W221 variants. This product is a third-party alternative.Brand/model references are included only to assist with compatibility identification.