The Mercedes — Benz M 276.820 is a 2,996 cc, V6 twin — turbocharged petrol engine produced between 2010 and 2017. It features direct fuel injection (CGI), variable valve timing (VVT), and spray — guided combustion for improved efficiency. Delivering 235–270 kW (320–367 PS) and torque outputs of 500–520 Nm, it was engineered to replace the naturally aspirated M 273 series with enhanced responsiveness and reduced fuel consumption.
Fitted to key models including the W212 E —…
Production years 2010–2014 meet Euro 5 standards; 2015–2017 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Mercedes-Benz M 276.820 is a 2,996 cc V6 twin-turbocharged petrol engine engineered for executive and luxury applications (2010–2017). It combines direct fuel injection with twin-scroll turbochargers to deliver strong mid-range torque and responsive acceleration. Designed to meet Euro 5 and Euro 6 emissions standards, it balances performance with improved fuel efficiency over its naturally aspirated predecessor.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,996 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 88.0 mm × 82.1 mm | |
Power output | 235–270 kW (320–367 PS) | |
Torque | 500–520 Nm @ 1,800–4,000 rpm | |
Fuel system | Direct injection (CGI), high-pressure fuel pump (up to 200 bar) | |
Emissions standard | Euro 5 (pre-2015); Euro 6 (2015–2017, market-dependent) | |
Compression ratio | 10.7:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin IHI turbochargers with twin-scroll design | |
Timing system | Chain-driven (dual, front-mounted) | |
Oil type | MB 229.51 (SAE 5W-30) | |
Dry weight | 195 kg |
The Mercedes-Benz M 276.820 was used across Mercedes-Benz's W212/W222/X204 platforms with longitudinal mounting. This engine received platform-specific adaptations-shortened intake manifolds in the E-Class and revised exhaust routing in the GLK-Class-and from 2015 the introduction of revised camshaft profiles in the S-Class created interchange limits. All adaptations are documented in OEM technical bulletins.
The M 276.820's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in high-mileage vehicles. Internal Mercedes-Benz quality reports from 2014 indicated a significant portion of pre-2014 engines required HPFP replacement before 120,000 km, while UK DVSA data shows petrol V6 engines account for a notable share of fuel system-related MOT advisories. Use of non-compliant fuel and extended oil intervals increase wear risk, making adherence to MB 229.51 specification and service schedules critical.
Analysis derived from Mercedes-Benz technical bulletins (2010-2017) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The M 276.820 offers strong performance and smooth operation, but early models (2010–2013) are prone to high-pressure fuel pump wear. Later units, especially post-2014 revisions, show improved durability when maintained properly. Regular oil changes with MB 229.51-specified 5W-30 oil every 15,000 km are essential. Well-maintained engines can exceed 180,000 km without major issues.
Key issues include high-pressure fuel pump wear (especially pre-2014), intake manifold flap actuator failure, coolant leaks from heater pipe O-rings, and ignition coil degradation. These are documented in Mercedes-Benz service bulletins. Carbon buildup in direct injection models and turbocharger wastegate sticking are less frequent but possible.
This V6 twin-turbo petrol engine was used in several executive and luxury models: the W212 E-Class (E 350/E 400), W222 S-Class (S 350/S 400), C218 CLS-Class (CLS 350/CLS 400), and X204 GLK-Class (GLK 350). It was phased out in 2017 and replaced by the M 256 inline-six. All variants are longitudinally mounted.
Yes, with moderate gains. ECU remapping can yield +30–50 kW on most variants due to headroom in turbo and fuel systems. However, the twin-turbo design limits extreme tuning compared to dedicated performance engines. Supporting modifications like intercooler upgrades and exhaust systems improve responsiveness. Over-tuning risks detonation, especially if fuel quality is poor.
Fuel consumption is typical for a twin-turbo V6. In a W212 E 400, expect ~11.5 L/100 km (city) and ~7.2 L/100 km (highway), or about 24 mpg UK combined. Real-world figures depend heavily on driving style, but 20–26 mpg (UK) is common. Use of RON 98 fuel is recommended for optimal performance and longevity.
Yes. The M 276.820 is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. While chain systems are generally robust, any signs of chain rattle or tensioner failure should be addressed immediately to prevent catastrophic engine failure.
Mercedes-Benz specifies SAE 5W-30 oil meeting MB 229.51 standard. This low-SAPS formulation is critical for protecting the high-pressure fuel pump and turbochargers. Oil must be changed every 15,000 km or annually. Using non-compliant oil increases wear and voids warranty on repairs.
Comprehensive technical documentation and regulatory references
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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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