The Mercedes — Benz OM642.870 is a 3,009 cc, V6 turbo — diesel engine produced between 2008 and 2015. It was engineered as a high — output variant within the OM642 series, designed for performance — oriented luxury sedans and SUVs. Featuring common — rail direct injection, variable geometry turbocharging (VGT), and double overhead camshafts (DOHC), it delivered 195 kW (265 PS) and 620 Nm of torque, offering strong acceleration and towing capability with refined operation…
Production years 2008–2015 meet Euro V emissions standards .
The Mercedes-Benz OM642.870 is a 3,009 cc V6 turbo-diesel engineered for high-performance luxury vehicles (2008–2015). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver strong power and responsive torque. Designed to meet Euro V standards, it integrates SCR-AdBlue technology for NOx control while maintaining drivability in executive and SUV platforms.
| 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 | 195 kW (265 PS) @ 3,600 rpm | |
Torque | 620 Nm @ 2,000–2,600 rpm | |
Fuel system | Bosch CRS 2.0 common-rail with piezoelectric injectors (up to 1,800 bar) | |
Emissions standard | Euro V | |
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 198 kg |
The Mercedes-Benz OM642.870 was used across Mercedes-Benz's W212, X164, and W164 platforms with longitudinal mounting and designated for high-performance applications. This engine received platform-specific adaptations-higher-flow oil cooler in the GL 350 CDI BlueTEC and revised EGR calibration for stop-start duty-and from 2012 updated emissions control software to meet evolving Euro V requirements, creating minor service part and calibration differences. All adaptations are documented in OEM technical bulletins.
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The OM642.870's primary reliability risk is piezoelectric injector degradation under sustained load, with elevated incidence in performance and urban applications. Internal Daimler reports from 2014 noted increased injector failure rates in pre-2012 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 injector and turbo stress, making fuel filtration and oil change adherence critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The OM642.870 offers strong torque and smooth operation, but pre-2012 models are prone to piezoelectric injector issues under heavy use. Later revisions improved injector durability through better cooling and calibration. Well-maintained engines with regular oil changes and quality diesel can exceed 300,000 km. Using MB 229.51 oil and adhering to service intervals is essential for longevity.
Key issues include piezoelectric fuel injector failure, turbocharger actuator sticking, EGR/intake coking, and coolant leaks from the thermostat housing. These are documented in Daimler service bulletins and field reports. Fuel system health depends heavily on diesel quality and maintenance frequency, especially in performance and urban applications.
The OM642.870 was used in the W212 E-Class, X164 GL-Class, and W164 M-Class from 2008 to 2015. It was primarily offered as the E 350 CDI, GL 350 CDI, and ML 350 CDI. All units meet Euro V standards and were built for performance and luxury applications.
Aftermarket ECU tuning is common on the OM642870 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In the E 350 CDI, combined consumption is approximately 8.5–10.2 L/100 km (27–33 mpg UK), depending on load and driving style. Highway efficiency improves to ~7.2 L/100 km (39 mpg), while urban use can exceed 13 L/100 km (22 mpg). Real-world economy is highly dependent on vehicle weight and driving conditions.
Yes. The OM642.870 is an interference engine, meaning piston-to-valve contact occurs if timing is lost. While the front-mounted dual chain is robust, any sign of timing wear or noise must be investigated immediately to prevent catastrophic internal damage. Regular inspection per OEM intervals is strongly advised.
Mercedes-Benz specifies SAE 5W-30 oil meeting MB 229.51 standard. This low-ash formulation protects the fuel injectors and turbocharger, and must be changed every 15,000 km or annually. Using non-compliant oils increases the risk of injector wear and DPF clogging, especially under high-load operation.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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