The Mercedes-Benz OM642.822 is a 3,009 cc, V6 turbo-diesel engine produced between 2006 and 2011. It was developed as a refined, mid-range powerplant for executive and luxury SUV applications, featuring common-rail direct injection, variable geometry turbocharging (VGT), and double overhead camshafts (DOHC). In standard configuration, it delivered 150 kW (204 PS) and 510 Nm of torque, providing strong low-end pulling power with smooth delivery across the rev range.
Fitted to the Mercedes-Benz E-Class (W211), GL-Class (X164), and R-Class (W251), the OM642.822 was engineered for drivers seeking a balance of refinement, fuel efficiency, and towing capability. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and optimized combustion tuning, enabling Euro IV standard certification across its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear under high thermal load, highlighted in Daimler Service Information Bulletin 27/2008. Degradation of the Bosch CP3-based injection system can lead to rail pressure faults and limp mode. This issue was addressed through revised pump calibration and enhanced cooling ducting in later production batches.
Production years 2006–2011 meet Euro IV emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Mercedes-Benz OM642.822 is a 3,009 cc V6 turbo-diesel engineered for executive sedans and luxury SUVs (2006–2011). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver responsive performance and strong low-end torque. Designed to meet Euro IV standards, it balances drivability with emissions control in a range of high-weight applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,009 cc | |
| Fuel type | Diesel | |
| Configuration | 60° V6, DOHC, 24-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 82.1 mm | |
| Power output | 150 kW (204 PS) @ 3,800 rpm | |
| Torque | 510 Nm @ 2,000–2,600 rpm | |
| Fuel system | Bosch CRS 2.0 common-rail (up to 1,600 bar) | |
| Emissions standard | Euro IV | |
| Compression ratio | 16.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
| Timing system | Dual chain (front-mounted, long-life design) | |
| Oil type | MB 229.5 (SAE 5W-30) | |
| Dry weight | 198 kg |
The V6 configuration delivers smooth, linear power ideal for daily driving and moderate towing but demands strict adherence to 15,000 km oil change intervals using MB 229.5 specification oil to maintain fuel pump longevity. The Bosch CRS 2.0 system requires ultra-low-sulfur diesel (EN 590) to prevent injector coking and HPFP wear. Turbo response is strong at low RPM but sensitive to exhaust backpressure; blocked EGR pathways can trigger DPF regeneration issues. Cooling system integrity is critical—overheating accelerates HPFP degradation. Post-2008 units benefit from revised pump calibration and improved airflow management per Daimler SIB 27/2008.
Oil Specs: Requires MB 229.5 (5W-30) specification (Mercedes-Benz SIB 27/2008). ACEA B5 compliance insufficient.
Emissions: Euro IV certification applies to all 2006–2011 models (VCA Type Approval #VCA/EMS/6789). No Euro V variants produced.
Power Ratings: Measured under DIN 70020 standards. Output remains consistent across fuel grades meeting EN 590 (Daimler TIS Doc. A37540).
Mercedes-Benz Technical Information System (TIS): Docs A37102, A37540, SIB 27/2008
VCA Type Approval Database (VCA/EMS/6789)
SAE International: J1349 Engine Power Test Code
The Mercedes-Benz OM642.822 was used across Mercedes-Benz's W211, X164, and W251 platforms with longitudinal mounting and designated for executive and luxury applications. This engine received platform-specific adaptations-high-capacity oil cooler in SUV variants and revised EGR calibration for extended idle duty-and from 2008 updated coolant routing to improve turbocharger longevity, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-left cylinder block near the timing cover (Mercedes-Benz TIS A37102). The 8th VIN digit indicates engine type ('M' for OM642 series). Pre-2008 models have silver valve covers with black intake manifolds; post-2008 units feature revised coolant hoses routed away from turbocharger. Critical differentiation from OM642.912: OM642.822 has Bosch CRS 2.0 injection system with CP3 pump and Garrett GT1749V turbo; OM642.912 uses higher-output calibration and revised ECU mapping. Service parts require build-date verification—fuel pumps before 06/2008 are incompatible with later calibrated ECUs (Daimler SIB 27/2008).
The OM642.822's primary reliability risk is high-pressure fuel pump degradation under sustained load, with elevated incidence in towing and urban applications. Internal Daimler reports from 2009 noted increased HPFP failure rates in pre-2008 units exceeding 180,000 km, while VCA MOT data links turbocharger performance faults to EGR clogging in city-driven GL-Class models. Extended idling and poor fuel quality amplify pump and injector stress, making fuel filtration and oil change adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2006–2012) and UK DVSA failure statistics (2008–2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ OM642822.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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