The Mercedes — Benz OM611.987 is a 2,151 cc, inline — four, turbocharged diesel engine produced between 1998 and 2004. It belongs to the second generation of the OM611 series, featuring indirect injection, a cast — iron block, SOHC valvetrain, and a mechanically controlled Bosch MAF inline injection pump. In standard tune, it produced 80 kW (109 PS) and 230 Nm of torque, offering balanced performance for compact executive and commercial applications.
Fitted to the W202 C —…
All production years 1998–2004 meet Euro 3 emissions standards .
The Mercedes-Benz OM611.987 is a 2,151 cc inline-four turbocharged diesel engine designed for compact and light commercial vehicles (1998–2004). It combines indirect injection with a mechanically controlled Bosch MAF-fuel pump to deliver responsive low-end torque and mechanical resilience. Designed to meet Euro 3 standards, it balances simplicity, reliability, and emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,151 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 87.0 mm × 90.0 mm | |
Power output | 80 kW (109 PS) @ 4,200 rpm | |
Torque | 230 Nm @ 1,800 rpm | |
Fuel system | Bosch MAF mechanical inline injection pump | |
Emissions standard | Euro 3 | |
Compression ratio | 22.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single fixed geometry turbocharger (KKK K16) | |
Timing system | Gear-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 195 kg |
The Mercedes-Benz OM611.987 was used across Mercedes-Benz's W202 and W904 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-reinforced engine mounts in the W904 and revised cooling hose routing in the W202-and remained mechanically unchanged throughout its production, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the OM611.987 is known for mechanical durability and long service life when maintained properly. Early fuel pumps (pre-2001) are vulnerable to control rack wear in high-idle applications, but later revisions improved reliability. With regular oil and fuel filter changes, cooling system maintenance, and use of quality diesel, these engines routinely exceed 350,000 km. Its gear-driven timing and robust turbocharger contribute to excellent reliability in both personal and commercial roles.
The most common issues are fuel injection pump control rack wear (especially pre-2001 units), turbocharger bearing failure due to oil starvation, cylinder head cracking on the exhaust side, and oil leaks from the valve cover and rear main seal. These are documented in Daimler service literature and widely reported in technical workshops specializing in classic Mercedes-Benz diesel engines.
The OM611.987 was used in the W202 C-Class (C200 CDI, 1998–2000) and W904 Sprinter (208 CDI, 1998–2004). It was primarily offered in European and select export markets. Unlike some OM611 variants, it was not used in passenger sedans beyond the C-Class or licensed to other manufacturers.
Limited tuning potential exists. The mechanical fuel pump can be recalibrated to increase output by ~10%, raising power to approximately 88 kW (120 PS), but this increases stress on the pump and turbocharger. Turbocharging is already factory-fitted, but intercooler upgrades and exhaust modifications can support modest gains. Most owners prioritize reliability over performance, keeping the engine in stock form for maximum longevity.
Fuel economy is good by modern standards. In a W202 C200 CDI, expect ~7.8 L/100km (36 mpg UK) in mixed driving. The heavier W904 Sprinter 208 CDI averages ~9.0 L/100km (31 mpg UK). Economy improves with steady cruising but drops significantly under load. The engine's efficiency is limited by its indirect-injection design, though the turbo improves specific output over naturally aspirated variants.
No. The OM611.987 is a non-interference engine. If the timing gears fail or the camshaft stops, the pistons will not contact the valves. This design enhances durability and reduces catastrophic failure risk, making it well-suited for remote or commercial use where immediate repair may not be possible.
Mercedes-Benz specifies SAE 15W-40 oil meeting ACEA B3/B4 standards, compatible with MB 229.1. High-quality mineral or semi-synthetic oil is recommended due to the mechanical fuel pump's lubrication requirements. Oil should be changed every 15,000 km or annually, with fuel filter replacement at every second oil change to protect the injection system.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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