The Mercedes — Benz M111.980 is a 1,998 cc, inline — four petrol engine produced between 1999 and 2000. It belongs to the final evolution of the M111 engine family, featuring a 16 — valve DOHC configuration and sequential multi — point fuel injection (SIMPLE). This naturally aspirated design delivers 102 kW (139 PS) at 5,500 rpm and 190 Nm of torque at 4,250 rpm, providing refined performance for compact executive applications.
Fitted primarily to the W202 C — Class and C208 CL…
Production years 1999–2000 meet Euro 2 emissions standards .
The Mercedes-Benz M111.980 is a 1,998 cc inline-four petrol engine engineered for compact executive models (1999–2000). It combines a 16-valve DOHC valvetrain with sequential fuel injection to deliver smooth, linear power delivery. Designed to meet Euro 2 standards, it balances drivability and refinement in naturally aspirated form.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 93.0 mm | |
Power output | 102 kW (139 PS) @ 5,500 rpm | |
Torque | 190 Nm @ 4,250 rpm | |
Fuel system | Sequential multi-point fuel injection (SIMPLE) | |
Emissions standard | Euro 2 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (single-row, non-interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 148 kg |
The Mercedes-Benz M111.980 was used across Mercedes-Benz's W202/C208 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-intake manifold tuning in the C208 and revised ECU mapping in facelifted W202 units-and from 1999 the updated W202 received revised camshaft profiles to improve low-end torque, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
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Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The M111.980 offers solid performance and smooth operation, but remains prone to intake camshaft lobe wear if maintenance intervals are extended or incorrect oil is used. Later M111 series revisions show improved durability when serviced correctly. Regular oil changes using MB 229.3 (10W-60) specification oil significantly enhance long-term reliability. Well-maintained units can exceed 200,000 km without major issues.
Primary concerns include intake camshaft lobe wear, cooling system failures (thermostat/hoses), lambda sensor degradation, and fuel injector clogging. These are documented in Mercedes-Benz Service Bulletin 07-0501-98 and TIS documentation. Preventive maintenance, especially oil and coolant service, greatly reduces the likelihood of these failures.
The M111.980 was used in the Mercedes-Benz C-Class (W202) C 200 and C 230 (1999–2000) and CLK (C208) CLK 200 and CLK 230 (1999–2000). It was not exported to North America and remained exclusive to European and select international markets. All applications feature longitudinal mounting and share platform-specific ECU tuning.
Limited tuning potential exists due to its naturally aspirated design. ECU remapping can yield modest gains (~10–15 PS) by optimizing fuel and ignition maps. However, significant power increases require internal modifications. As the engine was not designed for forced induction, adding a supercharger or turbocharger involves substantial engineering and is not supported by OEM documentation.
In combined driving, the M111.980 achieves approximately 8.5–9.5 L/100km (30–33 mpg UK). Highway efficiency improves to ~7.0 L/100km (40 mpg UK), while city driving may reach 11.0 L/100km (26 mpg UK). Real-world consumption depends on driving style and vehicle weight. Fuel quality per EN 228 ensures optimal injector and catalyst longevity.
No. The M111.980 features a non-interference valvetrain design. If the timing chain fails or jumps, the pistons will not contact the valves, preventing catastrophic internal damage. However, the engine will cease to run, and repair of the chain and tensioner is still required. This design improves service safety but does not reduce the importance of regular inspection.
Mercedes-Benz specifies MB 229.3 (SAE 10W-60) or equivalent ACEA A3/B3 oil for the M111.980. Oil changes should occur every 15,000 km or annually. Using incorrect viscosity or lower-specification oil increases the risk of camshaft lobe wear, particularly in high-load conditions. Always verify oil meets MB 229.3 standards before use.
Comprehensive technical documentation and regulatory references
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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