The Mercedes-Benz M276.823 is a 2,996 cc, V6 twin-turbocharged petrol engine produced between 2011 and 2017. It features a 90-degree V6 configuration with dual overhead camshafts (DOHC), variable valve timing (VVT) on both intake and exhaust, and direct fuel injection (BlueDIRECT). In standard tune, it delivers 235 kW (320 PS) and 500 Nm of torque, providing strong low-end responsiveness and smooth power delivery ideal for executive sedans and coupes.
Fitted to key models including the W204 C-Class, W212 E-Class, and X204 GLK-Class, the M276.823 was engineered for balanced performance, refinement, and emissions compliance. Emissions control was achieved through a three-way catalytic converter, exhaust gas recirculation (EGR), and oxygen sensor feedback systems, enabling Euro 5 compliance across all production years.
One documented reliability concern is premature high-pressure fuel pump failure, which can result in lean mixture conditions and engine misfires. This issue, detailed in Mercedes-Benz Service Bulletin 05/2013 (Ref. 276.823-0502), is attributed to wear in the camshaft-driven pump plunger assembly. From 2014, revised fuel pumps with hardened plungers were introduced to improve durability.
All production years 2011–2017 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The Mercedes-Benz M276.823 is a 2,996 cc twin-turbocharged V6 petrol engine developed for mid-to-large Mercedes-Benz platforms (2011–2017). It combines direct injection (BlueDIRECT) with twin-scroll turbochargers to deliver responsive performance and improved fuel efficiency. Designed to meet Euro 5 standards, it balances power delivery with emissions control for global markets.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,996 cc | |
| Fuel type | Petrol (Unleaded, 95 RON minimum) | |
| Configuration | 90° V6, DOHC, 24-valve | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 88.0 mm × 82.1 mm | |
| Power output | 235 kW (320 PS) @ 6,000 rpm | |
| Torque | 500 Nm @ 1,600–4,000 rpm | |
| Fuel system | Direct injection (BlueDIRECT), twin high-pressure pumps | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Twin-scroll turbochargers (one per bank), intercooled | |
| Timing system | Dual chain (primary and secondary), non-interference design | |
| Oil type | MB 229.51 (SAE 5W-30) | |
| Dry weight | 184 kg |
The twin-turbo V6 delivers strong low-end torque ideal for responsive urban driving but requires adherence to 15,000 km oil change intervals using MB 229.51 specification oil to prevent high-pressure fuel pump wear. Using lower-specification oils or extended intervals can accelerate plunger wear in the cam-driven fuel pump. Fuel quality is critical—minimum 95 RON unleaded petrol must be used to prevent pre-ignition and carbon buildup. Intake manifold gaskets and valve cover seals are prone to age-related leaks; pre-2014 models should be inspected for early fuel pump faults per SIB 05/2013. Emissions systems require functional oxygen sensors and catalytic converters to remain within Euro 5 limits.
Oil Specs: Requires MB 229.51 (5W-30) specification (Mercedes-Benz SIB 05/2013). Compatible with ACEA C2 standards.
Emissions: Euro 5 certification applies to all 2011–2017 models (VCA Type Approval #VCA/EMS/5680). No market-specific variants.
Power Ratings: Measured under DIN 70020 standards. Output remains consistent across fuel qualities meeting 95 RON minimum (Mercedes-Benz TIS Doc. A32012).
Mercedes-Benz Technical Information System (TIS): Docs A31574, A31893, SIB 05/2013
VCA Type Approval Database (VCA/EMS/5680)
DIN Standards: DIN 70020 Engine Power Measurement
The Mercedes-Benz M276.823 was used across Mercedes-Benz's W204, W212, and X204 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-intake manifold tuning in the C-Class and revised engine mounts in the E-Class-and from 2014 the updated high-pressure fuel pumps were introduced, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the timing cover (Mercedes-Benz TIS A31574). The 8th digit of the VIN identifies the engine family ('H' for M276 series). Pre-2014 models use silver cam covers with black plastic intake manifolds; post-2014 units retain the same appearance but feature revised high-pressure fuel pumps. Critical differentiation from M276.821: M276.823 has a 3.0L displacement (bore 88.0 mm), while M276.821 is 3.5L (bore 92.9 mm). Service parts require VIN verification—fuel pumps for pre-2014 builds are not interchangeable with post-2014 revisions (Mercedes-Benz SIB 05/2013).
The M276.823's primary reliability risk is high-pressure fuel pump wear on pre-2014 builds, with elevated incidence in vehicles with extended oil intervals. Internal Mercedes-Benz quality reports from 2014 indicated a significant portion of pre-2014 engines required pump replacement before 120,000 km, while UK DVSA MOT records show increased emissions failures linked to EGR and oxygen sensor faults in high-mileage units. Infrequent oil changes and low-quality fuel exacerbate pump and injector wear, making maintenance adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2012–2015) and UK DVSA failure statistics (2014–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M276823.
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Regulation (EC) No 715/2007
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