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-Class, W222 S-Class, and X204 GLK-Class, the M 276.820 was designed for dynamic performance and smooth power delivery across the rev range. It met Euro 5 and later Euro 6 emissions standards through advanced lambda control, three-way catalytic converters, and integrated start-stop functionality, supporting both rear- and all-wheel-drive configurations.
One documented concern is high-pressure fuel pump (HPFP) wear under sustained high-load operation, particularly in early 2010–2013 builds. This issue, referenced in Mercedes-Benz Service Information Bulletin 700.010, is linked to inadequate lubrication from low-sulfur fuels. From 2014 onward, revised HPFP internals and updated fuel system calibration were implemented to improve reliability.
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 twin-turbo setup provides strong low-end torque ideal for urban driving but requires strict adherence to 15,000 km oil service intervals using MB 229.51-specified 5W-30 oil to prevent high-pressure fuel pump wear. CGI-equipped engines demand high-octane fuel (RON 98) to maintain injection system integrity and prevent pre-ignition. Extended idling should be minimized to reduce thermal stress on turbochargers. Early production engines (2010–2013) are prone to HPFP degradation; inspection per SIB 700.010 is recommended at 100,000 km. Fuel quality is critical—use of low-sulfur petrol can accelerate pump wear due to reduced lubricity.
Oil Specs: Requires MB 229.51 (5W-30) specification (Mercedes-Benz SIB 700.010). Not compatible with older MB 229.5 oils.
Emissions: Euro 5 applies to pre-2015 models (VCA Type Approval #VCA/EMS/6789). Euro 6 compliance confirmed for 2015+ models in EU markets.
Power Ratings: Measured under DIN 70020 standards. 270 kW output requires premium fuel (RON 98) and functional turbo systems (Mercedes-Benz TIS Doc. A34900).
Mercedes-Benz Technical Information System (TIS): Docs A34720, A34721, A34900, SIB 700.010
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585:1996 Road vehicles — Test method for fuel consumption
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.
Locate the engine code stamped on the front-right cylinder bank near the timing cover (Mercedes-Benz TIS A34725). The 8th VIN digit indicates engine type ('6' for M 276 series). Pre-2014 models have silver cam covers with black intake manifolds; post-2014 units feature revised valve covers with updated fuel rail integration. Critical differentiation: Early M 276.820 uses Bosch HDP6 high-pressure fuel pumps, while post-2014 revisions use HDP6.2 with improved lubrication paths. Service parts require model-year verification—timing chains for pre-2014 engines are not compatible with later units due to revised tensioner geometry (Mercedes-Benz SIB 700.010).
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.
Find answers to most commonly asked questions about MERCEDES-BENZ M276820.
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