The Mercedes — Benz M 276.821 is a 2,996 cc, V6 petrol engine produced between 2012 and 2017. It features dual overhead camshafts (DOHC), variable valve timing (VVT) on both intake and exhaust, and direct fuel injection with spray — guided combustion. In standard tune it delivered 200 kW (272 PS) and 370 Nm of torque, offering a balance of responsive performance and fuel efficiency for executive and performance applications.
Fitted to key models including the W204 C — Class,…
All models meet Euro 6b standards; 2015–2017 units with cylinder deactivation comply with Euro 6c .
The Mercedes-Benz M 276.821 is a 2,996 cc V6 petrol engine developed for executive and performance platforms (2012–2017). It combines direct injection with variable valve timing to deliver smooth power delivery and strong mid-range torque. Designed to meet Euro 6b (and select Euro 6c) standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,996 cc | |
Fuel type | Petrol | |
Configuration | 60° V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 82.1 mm | |
Power output | 200 kW (272 PS) @ 6,500 rpm | |
Torque | 370 Nm @ 3,500–5,250 rpm | |
Fuel system | Direct injection (spray-guided, up to 200 bar) | |
Emissions standard | Euro 6b; Euro 6c with cylinder deactivation (2015–2017) | |
Compression ratio | 11.3:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain with hydraulic tensioner | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 184 kg |
The Mercedes-Benz M 276.821 was used across Mercedes-Benz's W204, W212, and W218 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-shortened accessory drives in the W204 and reinforced engine mounts in the W218-and from 2015 the facelifted W212 models adopted revised high-pressure fuel pump drives, 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 M 276.821 offers smooth performance and good refinement, but early models (2012–2014) are prone to high-pressure fuel pump drive wear. Later revisions (post-2015) feature improved pump drive components and chain dampers, significantly enhancing durability. With regular maintenance and correct oil (MB 229.51 0W-40), well-maintained units can reliably exceed 180,000 km.
The most documented issues are high-pressure fuel pump drive wear (causing stalling and misfires), oil leaks from valve cover gaskets, intake valve carbon buildup, and coolant pump impeller failure. These are confirmed in Mercedes-Benz service bulletins and field reports, with the HPFP issue being the most critical.
This 3.0L V6 petrol was used in several key models: C 300 (W204), E 300 (W212), CLS 300 (W218), and GLK 300 (X204), primarily from 2012 to 2017. It was not licensed to other manufacturers and was succeeded by the M 274 inline-4 in most applications.
Aftermarket ECU tuning is common on the M276821 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.
Moderate for a V6. In a W212 E 300, combined consumption is approximately 8.2 L/100 km (34.5 mpg UK), with city driving around 10.5 L/100 km and highway as low as 6.8 L/100 km. Real-world figures depend heavily on driving style, but expect 30–36 mpg UK under mixed conditions.
Yes. The M 276 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. While chain failure is rare, HPFP drive wear can indicate underlying timing issues, so early diagnosis of stalling or fault codes is essential.
Mercedes-Benz specifies SAE 0W-40 oil meeting MB 229.51 standard. This low-SAPS formulation is critical for protecting the high-pressure fuel pump and hydraulic lifters. Oil changes should be performed every 15,000 km or annually to maintain component longevity and prevent sludge buildup.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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