The Mercedes-Benz OM651.930 is a 2,143 cc, inline-four turbo-diesel engine produced between 2011 and 2018. It features common-rail direct injection, variable geometry turbocharging (VGT), and DOHC 16-valve configuration. In standard output, it delivers 125 kW (170 PS) and 400 Nm of torque, with applications across compact and mid-size executive vehicles.
Fitted to models such as the W204 C-Class, W207 C-Class Coupe, and X204 GLK-Class, the OM651.930 was engineered for balanced performance, fuel efficiency, and emissions compliance. Emissions compliance was achieved via exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 5 through Euro 6 certification depending on model year and market.
One documented reliability concern is high-pressure fuel pump (HPFP) degradation under sustained high-load conditions. This issue, highlighted in Mercedes-Benz Service Bulletin 20/2011, is linked to fuel contamination and marginal filtration in early builds. From 2014 onward, revised Bosch CP4-based fuel systems with improved filtration were implemented to enhance durability.
Production years 2011–2013 meet Euro 5 standards; 2014–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5686).
The Mercedes-Benz OM651.930 is a 2,143 cc inline-four turbo-diesel engineered for compact and executive applications (2011–2018). It combines common-rail direct injection with a variable-geometry turbocharger to deliver responsive power and strong low-end torque. Designed to meet Euro 5 and Euro 6 emissions standards, it balances everyday performance with efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,143 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 99.1 mm | |
| Power output | 125 kW (170 PS) @ 3,000–4,200 rpm | |
| Torque | 400 Nm @ 1,400–2,600 rpm | |
| Fuel system | Bosch CRS 3.0 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 (2011–2013); Euro 6 (2014–2018) | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett GT1544V) | |
| Timing system | Dual chain (front-mounted, robust design) | |
| Oil type | MB 229.5 (SAE 5W-30) | |
| Dry weight | 168 kg |
The inline-four configuration provides strong low-RPM torque ideal for urban and highway driving but demands strict adherence to 15,000 km oil change intervals using MB 229.5 specification oil to maintain turbo and HPFP longevity. Use of ultra-low-sulfur diesel (EN 590) is critical to prevent injector and fuel pump wear. Cold starts should be brief; prolonged idling increases EGR and DPF soot loading. Post-2014 models benefit from upgraded CP4 fuel pumps and enhanced filtration. EGR, DPF, and SCR systems require periodic regeneration and cleaning to prevent limp mode. Timing chains are generally durable but inspection is recommended beyond 200,000 km. AdBlue system maintenance is essential for Euro 5+ compliance.
Oil Specs: Requires MB 229.5 specification (Mercedes-Benz SIB 22/2007). Not compatible with ACEA A/B standards.
Emissions: Euro 5 applies to 2011–2013 models. Euro 6 compliance confirmed for 2014–2018 models in EU markets (VCA Type Approval #VCA/EMS/5686).
Power Ratings: Measured under DIN 70020. Output maintained across EU and North American variants (Mercedes-Benz TIS Doc. M13518).
Mercedes-Benz Technical Information System (TIS): Docs M12688, M13150, SIB 20/2011, SIB 22/2007
VCA Type Approval Database (VCA/EMS/5686)
ISO 1585:1996 Road vehicles — Test code for net power of internal combustion engines
The Mercedes-Benz OM651.930 was used across Mercedes-Benz's W204/W207/X204 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced engine mounts in the X204 and revised cooling circuits in the W207-and from 2014 the updated W204 facelift adopted the OM651.931 variant with CP4 fuel system revisions, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front of the cylinder block near the timing cover (Mercedes-Benz TIS M12898). The 8th VIN digit indicates engine type ('5' for OM651 series). Pre-2014 models have silver valve covers with ribbed plastic covers; post-2014 units use black valve covers. Critical differentiation from OM651.931: Original .930 uses Bosch CP3 HPFP with circular fuel filter housing, while .931 uses CP4 with rectangular housing. Service parts require production date verification - fuel pumps and injectors before 06/2014 are not compatible with later units due to CP4 system integration (Mercedes-Benz SIB 20/2011).
The OM651.930's primary reliability risk is high-pressure fuel pump degradation, with elevated incidence in high-mileage and mixed-use conditions. Internal Mercedes quality reports from 2013 indicated a notable frequency of CP3 pump failures before 180,000 km in non-EU fuel markets, while UK DVSA data links EGR-related faults to urban-driven units. Extended idling and poor fuel quality increase HPFP and injector stress, making fuel filtration and oil interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2011-2017) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ OM651930.
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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