Mercedes OM642 3.0 L V6 Diesel (2005–2022) The OM642 engine is Mercedes-Benz’s long-running 3.0 L V6 turbo-diesel used in E Class /ML/GL/GLK/G-Class, Sprinter/Vito, and even Jeep models. It’s loved for big torque, decent economy, and long life provided you stay ...