This piston rings set is compatible with M276 3.5L V6 engines found in models such as C300, C350, E300, E350, CLS300, CLS350, ML350, GLE350, R350, S350, SL350, and SLK350 equipped with engine codes M276.950, M276.952, M276.954, M276.955, M276.956, M276.957, and M276.958.Designed for 2011 to 2018 model years, the kit includes a 6-piece piston rings set.It supports proper cylinder sealing and oil control and meets specifications for fit and function.