The Mercedes — Benz M112.942 is a 2,151 cc, V6 petrol engine produced between 1999 and 2002. It features a 24 — valve DOHC configuration with sequential multi — point fuel injection (ME — SFI) and was engineered for mid — size luxury applications. This naturally aspirated design delivers 110 kW (150 PS) at 5,500 rpm and 210 Nm of torque at 3,500 rpm, providing smooth power delivery and refined throttle response.
Fitted primarily to the W210 E — Class and C208 CLK models—includin…
Production years 1999–2002 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/5682).
The Mercedes-Benz M112.942 is a 2,151 cc V6 naturally aspirated petrol engine engineered for mid-size luxury vehicles (1999–2002). It combines 24-valve DOHC architecture with sequential fuel injection to deliver smooth power delivery and dependable performance. Designed to meet Euro 2 emissions standards, it balances refinement with responsive drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,151 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 67.6 mm | |
Power output | 110 kW (150 PS) @ 5,500 rpm | |
Torque | 210 Nm @ 3,500 rpm | |
Fuel system | Sequential multi-point fuel injection (ME-SFI) | |
Emissions standard | Euro 2 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (non-interference design) | |
Oil type | MB 229.3 (SAE 10W-40) | |
Dry weight | 178 kg |
The Mercedes-Benz M112.942 was used across Mercedes-Benz's W210/C208 platforms with longitudinal mounting and shared architecture with Renault in select applications. This engine received platform-specific adaptations-revised intake manifolds in the E-Class and tuned engine mounts in the CLK-and from 2000 the facelifted W210 models adopted revised camshafts, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M112.942's primary reliability risk is camshaft wear on pre-2000 builds, with elevated incidence in high-mileage urban use. Internal Mercedes-Benz quality reports from 2002 indicated a notable share of early engines requiring camshaft replacement before 140,000 km, while UK DVSA records show a moderate rate of emissions-related MOT failures linked to lambda sensor degradation in fleet-operated vehicles. Extended idling and low-RPM operation increase lobe stress, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (1999-2003) and UK DVSA failure statistics (1999-2005). Repair procedures should follow manufacturer guidelines.
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The M112.942 offers solid reliability when maintained properly, though pre-2000 models are prone to camshaft wear. Later revisions (post-2000) with hardened camshafts significantly improved durability. Regular oil changes with MB 229.3 (10W-40) specification oil and timely lambda sensor replacement are essential for long-term operation. Well-maintained units can exceed 180,000 km.
Key issues include camshaft lobe wear (especially pre-2000), lambda sensor degradation, intake carbon buildup, and coolant leaks from the thermostat housing. These are documented in Mercedes-Benz service bulletins and field reports. Preventative maintenance greatly reduces the risk of major repairs.
The M112.942 was used in the W210 E-Class (E200) and C208 CLK-Class (CLK200) from 1999–2002. It was not licensed to other manufacturers. All applications meet Euro 2 emissions standards.
Tuning potential is limited due to its naturally aspirated design and non-interference valvetrain. ECU remaps offer minimal gains. Performance upgrades typically involve induction, exhaust, and camshaft modifications. However, such modifications are rare and may compromise reliability if not properly engineered.
In the E200 (W210), typical consumption is ~10.0 L/100km (city) and ~6.1 L/100km (highway), or about 36 mpg UK combined. Real-world figures vary with driving style, but expect 33–39 mpg (UK) on mixed roads for a well-maintained engine. Fuel quality (EN 228) is essential for consistent economy.
No. The M112.942 uses a non-interference valvetrain design. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic engine damage. However, chain replacement is still recommended at 180,000 km or as per service schedule to maintain reliability.
Mercedes-Benz specifies SAE 10W-40 oil meeting MB 229.3 standard. This high-quality synthetic blend is essential for protecting cam lobes and ensuring longevity. Oil changes should be performed every 15,000 km or annually to prevent wear and maintain performance.
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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