STD 0.5 Engine Part Piston and Rings Set designed for 2.1 L diesel engines with OM651 engine code from model years 09 to 18.Compatible with C Class, E Class, S Class, V Class, CLS, GLE, GLK, SLC, SLK, ML, and VITO models.This piston and rings set is engineered to meet specifications for performance and proper fitment during engine repair or rebuilding.