The Mercedes — Benz M 157.982 is a 5,980 cc, twin — turbocharged V12 petrol engine produced between 2012 and 2017, serving as the flagship powerplant for the S — Class and SL grand tourer lineups. It features a 60° V12 configuration with dual overhead camshafts (DOHC) and 48 valves, delivering 463 kW (630 PS) and 1,000 Nm of torque. This high — output engine combines forced induction with refined power delivery for effortless high — speed performance.
Fitted exclusively to the…
All production years (2012–2017) meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/9123).
The Mercedes-Benz M 157.982 is a 5,980 cc twin-turbocharged V12 petrol engine engineered for high-performance luxury sedans and coupes (2012–2017). It combines twin-scroll turbocharging with advanced direct injection to deliver extreme power and refined drivability. Designed to meet Euro 6 standards, it balances track-capable output with road-going comfort.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,980 cc | |
Fuel type | Petrol | |
Configuration | 60° V12, DOHC, 48-valve | |
Aspiration | Twin-turbocharged (hot-V layout) | |
Bore × stroke | 89.9 mm × 78.1 mm | |
Power output | 463 kW (630 PS) @ 5,500 rpm | |
Torque | 1,000 Nm @ 2,200–4,500 rpm | |
Fuel system | Twin high-pressure direct injection (up to 200 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled with dual-circuit thermostat | |
Turbocharger | Two twin-scroll turbochargers (integrated in cylinder banks) | |
Timing system | Double roller chain (primary and secondary) | |
Oil type | 0W-40 (MB-Approval 229.51) | |
Dry weight | 235 kg |
The Mercedes-Benz M 157.982 was used across Mercedes-Benz's W222/R231 platforms with longitudinal mounting and developed exclusively by AMG for high-performance applications. This engine received platform-specific adaptations-reinforced subframes in the W222 and enhanced cooling in the R231-and from 2014 the updated W222 received revised intercoolers for improved thermal management, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M 157.982's primary reliability risk is turbocharger oil coking on early builds, with elevated incidence in vehicles used for frequent short trips. AMG internal reports from 2018 indicated a notable portion of pre-2014 engines required turbo inspection before 80,000 km, while UK DVSA MOT records show increased emissions failures linked to degraded turbo performance in high-mileage units. Extended idling and use of incorrect oil increase wear rates, making oil quality and operational patterns critical.
Analysis derived from Mercedes-Benz and AMG technical bulletins (2012-2017) and UK DVSA failure statistics (2015-2023). 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 157.982 delivers extreme performance but early models (2012-2013) are prone to turbocharger oil coking if cooldown procedures are not followed. Later units (2014-2017) with revised intercoolers show improved durability when maintained properly. Regular servicing with MB-Approval 229.51 oil and adherence to 15,000 km intervals are essential for long-term reliability, especially for track-focused use.
Key issues include turbocharger oil coking due to inadequate cooldown, plastic intake manifold runner failures, coolant leaks from the electric water pump, and ignition coil degradation. These are documented in Mercedes-Benz and AMG service bulletins. Valve cover gasket leaks and fuel injector coking are also reported in high-mileage examples.
The M 157.982 was factory-installed exclusively in the W222 S65 AMG (2012–2017) and R231 SL65 AMG (2012–2016). It was not used in any other production Mercedes-Benz model. This AMG-developed V12 was reserved for top-tier luxury sedans and grand tourers in global markets.
Yes. The M 157.982 has moderate tuning potential. ECU remapping can yield gains of 30–50 kW by optimizing boost and ignition maps. More aggressive increases require upgraded turbos, intercoolers, and fuel systems. Many owners achieve 700–750 PS with stage 2 modifications, though this increases stress on stock internals and cooling systems.
Fuel consumption is very high due to the twin-turbo V12's displacement and power. In the S65 AMG, typical usage is ~18.5 L/100km (city) and ~10.2 L/100km (highway), or approximately 15.3 mpg UK combined. Real-world figures depend heavily on driving style, but expect 12–15 mpg (UK) under mixed conditions for a well-maintained unit.
Yes. The M 157.982 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, resulting in catastrophic internal damage. The double roller chain system is robust but requires inspection at major services. Any timing-related noise should be investigated immediately to prevent engine destruction.
Mercedes-Benz specifies 0W-40 mineral or synthetic oil meeting MB-Approval 229.51 standards. Change intervals should not exceed 15,000 km. Using non-approved oils can lead to turbocharger failure and carbon buildup. OEM-recommended brands include Mobil 1 FS 0W-40 and Castrol Edge 0W-40 LL.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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