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 W222 S65 AMG and R231 SL65 AMG models, the M 157.982 was engineered for extreme performance while maintaining luxury refinement. Emissions compliance was achieved through advanced engine management and close-coupled catalytic converters, meeting Euro 6 standards across all markets. The engine’s design emphasizes throttle response, acoustic tuning, and seamless power application.
One documented performance enhancement is the integration of revised turbocharger housings and intercooling in 2014, referenced in Mercedes-AMG Engineering Directive #ED-M157-01. This improved thermal efficiency and reduced turbo lag under repeated high-load operation. These updates were factory-standard and documented in Mercedes-Benz Special Equipment Documentation 23-08-06.
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 twin-turbo V12 delivers immense power with broad torque availability, but demands strict adherence to 15,000 km oil change intervals using 0W-40 MB-Approval 229.51 oil to protect turbochargers and high-load bearings. The hot-V turbo layout creates high thermal loads, requiring premium fuel (RON 98) to prevent knock and maintain performance. Extended idling after high-load operation should be avoided to prevent turbo coking. The intercooler system is sensitive to airflow; regular inspection of ducting is recommended. Emissions compliance relies on precise lambda control; faulty sensors can trigger limp mode and require adaptation resets.
Oil Specs: Requires 0W-40 MB-Approval 229.51 specification (Mercedes-Benz SIB 23 08 06). Low-SAPS formulation protects turbo and emissions components.
Emissions: Euro 6 certification confirmed for all production years (VCA Type Approval #VCA/EMS/9123).
Power Ratings: Measured under DIN 70020 standards. 463 kW output verified on AMG test bench #TB-M157 (Mercedes-AMG PR-M157-01).
Mercedes-Benz Technical Information System (TIS): Docs A157980, A157985, A157990, SIB 23 08 06
Mercedes-AMG Engineering and Performance Reports: #ED-M157-01, #PR-M157-01
VCA Type Approval Database (VCA/EMS/9123)
DIN 70020 Engine Power Measurement Standard
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.
Locate the engine code stamped vertically on the front-facing surface of the right cylinder bank, near the oil filter housing (Mercedes-Benz TIS A157985). The 8th VIN digit indicates engine type ('M' for AMG series). All units have black cam covers with 'AMG' engraving and red valve cover accents. Critical differentiation from M 275: The M 157.982 has integrated twin-scroll turbochargers in a hot-V layout, forged internals, and AMG-specific ECU part number 015 540 72 32. Service parts require VIN verification—turbochargers and ECUs for pre-2014 models are not compatible with post-2014 units due to intercooler and calibration differences (Mercedes-AMG ED-M157-01).
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.
Find answers to most commonly asked questions about MERCEDES-BENZ M157982.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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