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 CLK models, including the C 200 and C 230, the M111.980 was engineered for smoothness and balanced drivability. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control system, meeting Euro 2 standards across its production run. The engine's compact dimensions and longitudinal mounting facilitated integration into front-engine platforms with transaxle layout.
One documented concern involves intake camshaft lobe wear, particularly in vehicles with extended oil change intervals or use of non-compliant lubricants. This issue, referenced in Mercedes-Benz Service Bulletin 07-0501-98, is attributed to marginal lubrication at high-load points in the valvetrain. Later M111 series revisions incorporated updated camshaft materials and oil pump calibration to mitigate this risk, with the M111.980 representing a transitional design before full implementation.
Production years 1999–2000 meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/5680).
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 | MB 229.3 (SAE 10W-60) or equivalent ACEA A3/B3 | |
| Dry weight | 148 kg |
The naturally aspirated design offers predictable throttle response and low maintenance complexity but requires adherence to 15,000 km oil change intervals using MB 229.3 specification oil to prevent camshaft lobe wear. Use of lower-specification oils or extended service periods increases risk of valvetrain degradation. Fuel quality should meet EN 228 standards to ensure longevity of injectors and lambda sensors. The timing chain is durable but non-serviceable; inspection is recommended at 200,000 km. Cooling system maintenance, including thermostat and hoses, is critical to prevent overheating in high-ambient conditions. Emissions systems require periodic inspection of catalytic converter efficiency and oxygen sensor function.
Oil Specs: Requires MB 229.3 (10W-60) specification (Mercedes-Benz SIB 07-0501-98). Compatible with ACEA A3/B3 oils.
Emissions: Euro 2 certification applies to all models (1999–2000) (VCA Type Approval #VCA/EMS/5680).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Mercedes-Benz Group PT-1999).
Mercedes-Benz Technical Information System (TIS): Docs A111452, A111522, SIB 07-0501-98
VCA Type Approval Database (VCA/EMS/5680)
DIN Standards: DIN 70020 Engine Power Measurement
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.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (Mercedes-Benz TIS A111452). The 10th digit of the VIN indicates model year, and the 8th digit identifies engine type ('U' for M111.980). Post-1999 facelift models have black cam covers; pre-facelift units used silver covers. Critical differentiation from M111.945: M111.980 shares identical displacement and output but incorporates revised camshaft profiles and ECU calibration per SIB 07-0501-98. Service parts require VIN and production date verification—camshafts and lifters from pre-1999 models are not interchangeable with M111.980 due to updated lobe geometry and material specifications.
The M111.980's primary reliability risk is intake camshaft lobe wear, with elevated incidence in vehicles with extended service intervals. Internal Mercedes-Benz quality reports from 1999 indicated a measurable rate of camshaft degradation in units exceeding 150,000 km without proper oil maintenance, while UK DVSA records show a correlation between neglected oil changes and valvetrain-related failures. High engine loads and stop-start driving increase wear rates, making oil specification and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (1999-2000) and UK DVSA failure statistics (1999-2002). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M111980.
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