Mercedes-Benz OM651 Engine Introduction
The OM651 is a highly successful inline-four cylinder turbocharged diesel engine developed by Daimler AG (Mercedes-Benz), launched in 2008 as a replacement for the older OM646 engine family. It is widely praised for its high efficiency, strong low-end torque, low emissions, and good reliability, and has been used in numerous Mercedes-Benz passenger cars, SUVs, and commercial vehicles.
Basic Specifications
- Engine Type: Inline 4-cylinder, 4-stroke, water-cooled turbocharged diesel engine
- Displacement: 1.8L (1,796 cc) / 2.1L (2,143 cc)
- Block & Head: Cast iron engine block + aluminum alloy cylinder head
- Valvetrain: DOHC 16-valve, timing chain drive
- Fuel System: High-pressure common-rail injection with piezoelectric injectors
- Aspiration: Single VGT turbocharger or bi-turbo system (high-output versions)
- Emission Standards: Euro 5, Euro 6, equipped with EGR, DPF and SCR (AdBlue) system
Typical Output Versions
- 180 CDI: 136 hp / 330 Nm
- 220 CDI: 170 hp / 400 Nm
- 250 CDI (Bi-turbo): 204 hp / 500 Nm
Main Applications
Mercedes-Benz C-Class, E-Class, GLK, GLC, ML/GLE, Vito/V-Class, Sprinter and other models.