The Mercedes — Benz OM602.980 is a 2,997 cc, inline — five, turbocharged diesel engine produced between 1995 and 1998. It features indirect injection via a pre — chamber system and a SOHC valvetrain with mechanical valve clearance adjustment. Delivering 85 kW (116 PS) at 4,200 rpm and 255 Nm of torque at 2,200 rpm, it was engineered for commercial and fleet applications requiring durability and moderate performance.
Fitted to the W124 300D and select commercial chassis var…
Production years 1995–1998 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/5679).
The Mercedes-Benz OM602.980 is a 2,997 cc inline-five diesel engine engineered for commercial and fleet applications (1995–1998). It combines indirect injection with a robust SOHC valvetrain to deliver reliable, low-maintenance performance. Designed to meet Euro 2 standards, it prioritizes durability over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,997 cc | |
Fuel type | Diesel | |
Configuration | Inline-5, SOHC, 10-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 97.0 mm × 85.0 mm | |
Power output | 85 kW (116 PS) @ 4,200 rpm | |
Torque | 255 Nm @ 2,200 rpm | |
Fuel system | Bosch inline injection pump, indirect injection (pre-chamber) | |
Emissions standard | Euro 2 | |
Compression ratio | 21.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | KKK K26 turbocharger | |
Timing system | Chain-driven camshaft (single-row), manual valve adjustment | |
Oil type | SAE 10W-40, ACEA B2/B3 | |
Dry weight | 205 kg |
The Mercedes-Benz OM602.980 was used across Mercedes-Benz's W124 platform with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-longer oil pan in estate variants-and from 1996 the facelifted W124 models adopted revised oil gallery design to address main bearing wear, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
The OM602.980's primary reliability risk is rear main bearing wear, with elevated incidence in vehicles used under sustained load or with poor lubrication maintenance. Internal Mercedes-Benz field reports from 1996 noted a significant number of pre-1996 units requiring bearing replacement before 180,000 km, while VCA MOT data links extended oil intervals to early bearing failures. Infrequent oil changes and infrequent coolant replacements increase thermal and mechanical stress, making scheduled maintenance critical.
Analysis derived from Mercedes-Benz technical bulletins (1995-1998) and UK DVSA failure statistics (1996-2004). Repair procedures should follow manufacturer guidelines.
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The OM602.980 is fundamentally robust and capable of exceeding 350,000 km with diligent maintenance. However, pre-1996 models are prone to rear main bearing wear under sustained load. Later units with revised oil galleries are more durable. Regular oil and coolant changes, using correct 10W-40 oil, and avoiding sustained high loads are essential for longevity.
The most documented issues are rear main bearing wear (especially pre-1996), turbocharger oil seal leakage, injection pump timing drift, and cooling system failures. These are confirmed in Mercedes-Benz service bulletins and long-term owner reports. Preventative maintenance significantly reduces failure rates.
The OM602.980 was used exclusively in the W124 300D series (sedan and estate) from 1995 to 1998. It was not used in other model lines or licensed to other manufacturers. All applications meet Euro 2 emissions standards.
No meaningful tuning potential exists. The engine is turbocharged with a mechanical inline pump and no ECU. Output is fixed at 116 PS. Modifications are impractical and compromise reliability. The design prioritizes durability and economy over performance.
Fuel economy is modest by modern standards. In a W124 300D, expect 7.8–8.5 L/100km (36–33 mpg UK) in mixed driving. Highway efficiency improves to ~7.0 L/100km (40 mpg UK). Real-world consumption depends heavily on vehicle condition and driving style.
Yes. The OM602.980 is an interference engine. If the timing chain fails or skips, piston-to-valve contact will occur, resulting in severe internal damage. Regular inspection of the chain and tensioner is critical, especially on high-mileage engines.
Mercedes-Benz specifies SAE 10W-40 oil meeting ACEA B2/B3 standards (compatible with MB 229.1). Change intervals should not exceed 30,000 km or 2 years. Proper oil is vital for main bearings, turbocharger, and piston cooling, especially given the high compression ratio and mechanical valve train.
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MERCEDES-BENZ Official Site
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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
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VCA Certification Portal
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