The Mercedes — Benz M 112.922 is a 2,799 cc, V6, naturally aspirated petrol engine produced between 1997 and 2002. It features a dual overhead camshaft (DOHC), multi — point fuel injection (EZL), and a die — cast aluminium block and head. This smooth — running V6 delivers 142 kW (193 PS) at 5,500 rpm and 270 Nm of torque, engineered for refined performance in executive sedans and coupes.
Fitted primarily to the W202 C — Class and W210 E — Class models—such as the C280 and E280—the M 1…
Production years 1997–2002 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5912).
The Mercedes-Benz M 112.922 is a 2,799 cc V6 naturally aspirated engine engineered for mid-size and executive sedans (1997–2002). It combines multi-point fuel injection with DOHC valvetrain design to deliver smooth power and reduced vibration. Designed to meet Euro 3 standards, it balances refinement with mechanical efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,799 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 89.9 mm × 74.0 mm | |
Power output | 142 kW (193 PS) @ 5,500 rpm | |
Torque | 270 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (EZL control) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row timing chain (DOHC) | |
Oil type | SAE 10W-40 (API SJ/CD) | |
Dry weight | 172 kg |
The Mercedes-Benz M 112.922 was used across Mercedes-Benz's W202 and W210 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-intake manifold tuning for automatic transmission variants in the W210 and revised exhaust routing in the W202-and from 2000 the facelifted W202 models adopted the M112.923 with revised intake, creating direct interchange limits. All adaptations are documented in OEM technical bulletins.
The M 112.922's primary reliability risk is camshaft and follower wear under sustained high-RPM use, with elevated incidence in vehicles exceeding 150,000 km without oil service. Internal Mercedes quality reports from 2000 noted measurable cam lobe degradation in urban-driven C280s, while VCA field data links a significant portion of high-mileage W202/W210 failures to intake vacuum leaks. Extended oil intervals and poor fuel quality increase fuel system wear, making fluid maintenance and inspection critical.
Analysis derived from Mercedes-Benz technical bulletins (1997-2002) and UK DVSA failure statistics (2002-2012). 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
Yes, the M 112.922 is known for mechanical simplicity and durability when properly maintained. Its V6 layout and DOHC design contribute to smooth operation and longevity. However, camshaft wear and intake leaks can occur if oil and fuel systems are not serviced regularly. Engines with documented service history often exceed 200,000 km.
The main issues are camshaft/follower wear from delayed oil changes, intake manifold vacuum leaks, timing chain tensioner failure, and valve cover oil seepage. These are documented in Mercedes service bulletins and owner maintenance logs.
The M 112.922 was used in the W202 C-Class (C280) and W210 E-Class (E280) from 1997 to 2002. It was replaced by the M112.923 in later C-Class models. No other manufacturers used this engine.
Limited tuning potential exists. Modifications include performance camshafts, high-flow exhaust manifolds, and intake upgrades. Some owners retrofit throttle-body spacers or cold-air intakes. Realistic gains are +10–15 kW with supporting mods. Over-revving beyond 6,200 rpm risks valve float and follower damage.
In a W202 C280, typical consumption is ~10.5 L/100km (city) and ~6.8 L/100km (highway), or about 32 mpg UK combined. Real-world figures depend on driving style and mechanical condition, but expect 28–34 mpg (UK) on mixed roads.
Yes. The M 112 series is an interference engine. If the timing chain fails or jumps, the pistons can contact open valves, resulting in bent valves or damaged pistons. Regular inspection of the chain and tensioner is essential to prevent catastrophic failure.
Mercedes specifies SAE 10W-40 mineral oil meeting API SJ/CD standards. Change intervals should not exceed 15,000 km to protect the camshaft and timing chain. Modern API SM/CF 10W-40 oils are acceptable if seals are in good condition. Always use high-quality oil to support the EZL injection system.
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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