The Mercedes — Benz M 156.980 is a 6,208 cc, V8 petrol engine produced between 2006 and 2011. It served as the high — performance naturally aspirated powerplant for AMG models, featuring a 90° V8 layout with dual overhead camshafts (DOHC) and 32 valves. In standard tune, it delivered 386 kW (525 PS), with torque output of 630 Nm, providing aggressive throttle response and track — capable performance.
Fitted to the W221 S — Class, W219 CL — Class, and C219 CLK — Class AMG variants,…
All production years 2006–2011 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5682).
The Mercedes-Benz M 156.980 is a 6,208 cc V8 petrol engine engineered for high-performance applications (2006–2011). It combines naturally aspirated breathing with individual throttle bodies to deliver aggressive power and track-focused dynamics. Designed to meet Euro 4 standards, it balances high-RPM performance with street usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,208 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 102.2 mm × 94.6 mm | |
Power output | 386 kW (525 PS) @ 6,800 rpm | |
Torque | 630 Nm @ 5,200 rpm | |
Fuel system | Sequential multi-point fuel injection (ME2.1 with individual throttles) | |
Emissions standard | Euro 4 | |
Compression ratio | 12.3:1 | |
Cooling system | Water-cooled | |
Turbocharger | N/A | |
Timing system | Double-row roller chain (SOHC-style drive with DOHC cams) | |
Oil type | SAE 5W-40 MB 229.5 | |
Dry weight | 208 kg |
The Mercedes-Benz M 156.980 was used across Mercedes-Benz's W221, W219, and C219 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-reinforced engine mounts in the W221 and shortened accessory drives in the C219-and from 2009 the facelifted W221 models adopted revised intake manifolds and updated engine management, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 156.980's primary reliability risk is camshaft adjuster wear on early builds, with elevated incidence in high-mileage performance use. Internal Mercedes quality reports from 2009 noted a significant number of pre-2009 engines requiring adjuster replacement before 100,000 km, while UK DVSA records indicate cooling system failures as a leading cause of overheating-related breakdowns. Extended service intervals and poor coolant maintenance increase wear and thermal stress, making fluid and oil discipline critical.
Analysis derived from Mercedes-Benz technical bulletins (2006-2011) and UK DVSA failure statistics (2008-2015). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M 156.980 offers exhilarating performance but early models (2006-2009) are prone to cam adjuster issues if maintenance is delayed. Later units (post-2009) with revised adjusters and improved oil feeds are significantly more durable. When maintained with correct oil (5W-40 MB 229.5) and regular coolant service, these engines can reliably exceed 150,000 km.
Primary issues include camshaft adjuster wear (especially pre-2009), cooling system failures (water pump, thermostat), oil leaks from valve cover gaskets, and intake manifold runner binding. These are documented in Mercedes technical bulletins and field service reports from the late 2000s and early 2010s.
This 6.3L V8 was used exclusively in AMG models: the W221 S-Class (S 63 AMG), W219 CL-Class (CL 63 AMG), and C219 CLK-Class (CLK 63 AMG). Production spanned from 2006 to 2011, with minor updates in 2009 improving intake and engine management systems. It was not used in any other Mercedes or third-party vehicles.
Limited tuning potential exists. ECU remapping can yield modest gains (~20-30 kW) by optimizing fuel and ignition maps, but the naturally aspirated design limits output. Forced induction conversions are extremely complex and require extensive modifications. Most owners preserve stock tuning to maintain reliability and engine longevity.
Fuel consumption is very high by modern standards. In the W221 S 63 AMG, typical usage is ~20 L/100km (city) and ~12 L/100km (highway), or about 14 mpg UK combined. Real-world figures depend on driving style, but expect 12-14 mpg (UK) in mixed conditions. High-octane fuel (RON 98) is required for optimal performance.
Yes. The M 156 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. While chain durability is generally good, any signs of timing noise or wear should be investigated immediately to prevent catastrophic failure.
Mercedes specifies SAE 5W-40 oil meeting MB 229.5 specification. Use of high-quality synthetic oil is critical to protect the high-performance valvetrain and maintain viscosity under high thermal load. Change intervals should not exceed 15,000 km or 24 months to prevent sludge and adjuster wear, especially in early production engines.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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