The Mercedes — Benz OM642.864 is a 2,987 cc, V6 turbo — diesel engine produced between 2008 and 2013. It was engineered as a mid — range diesel powerplant for executive and luxury SUV applications, featuring common — rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain architecture. In standard tune it delivered 165 kW (224 PS) and 540 Nm of torque, providing strong low — end response suitable for urban and highway driving in heavy vehicles.
Fit…
All production years 2008–2013 meet Euro 5 emissions standards .
The Mercedes-Benz OM642.864 is a 2,987 cc V6 turbo-diesel engineered for mid-size and full-size luxury vehicles (2008–2013). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver strong low-end torque and smooth power delivery. Designed to meet Euro 5 standards, it balances premium refinement with robust diesel efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,987 cc | |
Fuel type | Diesel | |
Configuration | 60° V6, DOHC, 24-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 88.0 mm × 82.1 mm | |
Power output | 165 kW (224 PS) @ 3,600 rpm | |
Torque | 540 Nm @ 1,600–2,400 rpm | |
Fuel system | Bosch CRS 2.0 common-rail (up to 1,800 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 17.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
Timing system | Dual-row roller chain (front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 198 kg |
The Mercedes-Benz OM642.864 was used across Mercedes-Benz's W212/W221/W164 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-longer intake manifolds in the W212 and revised exhaust routing in the W221-and from 2010 the facelifted W212 LCI models adopted updated EGR cooling, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The OM642.864 offers smooth power and good efficiency, but pre-2009 models are prone to high-pressure fuel pump wear if maintenance is delayed. Later units with updated pumps and filters show improved durability. Regular oil changes using MB 229.51 5W-30 and high-quality diesel fuel are essential for longevity. Well-maintained examples can exceed 250,000 km without major repairs.
Key issues include high-pressure fuel pump degradation, EGR valve/coolant clogging, turbo actuator sticking, and valve cover oil leaks. These are documented in Mercedes-Benz service bulletins, particularly SIB 20/2009 for the HPFP. Carbon buildup in intake and EGR systems is common in city-driven vehicles with short trip cycles.
This 3.0L V6 diesel was used in the W212 E-Class (E 320 CDI), W221 S-Class (S 350 CDI), and W164 ML-Class (ML 320 CDI) from 2008 to 2013. It was not offered in other model lines or licensed to third parties. All units meet Euro 5 emissions standards and feature longitudinal engine mounting.
Aftermarket ECU tuning is common on the OM642864 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 320 CDI (W212), typical consumption is ~10.4 L/100km (city), ~6.7 L/100km (highway), or ~8.2 L/100km combined (34 mpg UK). Real-world figures vary by driving style, but expect 32–37 mpg (UK) in mixed conditions. The V6 layout and vehicle weight result in efficiency between four-cylinder and larger V8 diesels.
Yes. The OM642 series is an interference engine. If the timing chain fails or skips, pistons will contact open valves, resulting in severe internal damage. The front-mounted dual-row chain is robust but requires proper lubrication. Any abnormal noise from the timing cover should prompt immediate inspection.
Mercedes-Benz specifies SAE 5W-30 oil meeting MB 229.51 standard. This low-ash formulation protects the EGR and turbo systems and ensures proper HPFP lubrication. Oil changes should occur every 15,000 km or annually, whichever comes first, to maintain engine longevity and prevent deposit formation.
Comprehensive technical documentation and regulatory references
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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
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VCA Certification Portal
Type-approval guidance and documentation.
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