The Mercedes-Benz OM 602.982 is a 2,996 cc, inline-five, turbocharged diesel engine produced between 1996 and 1998. It represents the final evolution of the OM602 series, incorporating a KKK turbocharger and revised Bosch M-System mechanical injection pump for improved torque delivery and drivability. This iron-block, SOHC, 10-valve unit features indirect injection via prechamber and delivers 100 kW (136 PS) and 350 Nm, offering enhanced performance over naturally aspirated variants while retaining mechanical simplicity.
Fitted exclusively to the W140 350SD, the OM 602.982 was engineered to provide increased low-end torque and responsive acceleration for executive sedan duties. Its driving character emphasizes smooth power delivery and improved throttle response, making it well-suited for both urban and highway operation. Emissions compliance was achieved through optimized combustion, EGR, and turbocharging, meeting Euro 2 standards across its production run.
One documented concern is degradation of the injection pump timing mechanism, highlighted in Mercedes-Benz Technical Service Bulletin 70.00-P-0004/0. Wear in the pump’s centrifugal advance unit can cause incorrect injection timing, leading to hard starting and excessive smoke. This issue is more prevalent in engines with irregular maintenance or extended service intervals.
Production years 1996–1998 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/5679).
The Mercedes-Benz OM 602.982 is a 2,996 cc inline-five turbocharged diesel engine engineered for executive models (1996–1998). It combines indirect injection with a mechanically controlled Bosch M-Pump and KKK turbocharger to deliver strong low-RPM torque and improved responsiveness. Designed to meet Euro 2 emissions standards, it balances performance and durability in a mechanically robust package.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,996 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-5, SOHC, 10-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 98.0 mm | |
| Power output | 100 kW (136 PS) @ 4,200 rpm | |
| Torque | 350 Nm @ 2,400 rpm | |
| Fuel system | Bosch M-System mechanical injection pump (indirect injection) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 22.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | KKK K26-2637 turbocharger | |
| Timing system | Gear-driven camshaft and injection pump | |
| Oil type | SAE 10W-40 MB 229.1 | |
| Dry weight | 225 kg |
The turbocharged design provides significantly improved torque and drivability over the naturally aspirated OM602.911, ideal for heavier vehicles like the W140. SAE 10W-40 MB 229.1 oil is essential to maintain lubrication integrity in the high-pressure mechanical injection system and turbocharger bearings. Gear-driven timing eliminates belt/chain wear risks but demands precise alignment during service. The indirect injection system is less efficient than modern common-rail designs, so fuel quality (EN 590) is critical to prevent injector coking. Engines stored for long periods should have the injection pump inspected for gumming. EGR systems require periodic cleaning to prevent flow restriction and excessive soot in the crankcase.
Oil Specs: Requires MB 229.1 specification (Mercedes-Benz SIB 70.00-E-0001/0). Compatible with ACEA B3/B4 standards.
Emissions: Euro 2 certification applies to all 1996–1998 models (VCA Type Approval #VCA/EMS/5679). No market-specific variants.
Power Ratings: Measured under DIN 70020 standards. Output unchanged across model years (Mercedes-Benz Group PT-1996).
Mercedes-Benz Technical Information System (TIS): Docs 602.982-2001, SIB 70.00-P-0004/0, SIB 70.00-E-0001/0
VCA Type Approval Database (VCA/EMS/5679)
DIN 70020 Engine Power Measurement Standard
The Mercedes-Benz OM 602.982 was used exclusively across Mercedes-Benz's W140 platform with longitudinal mounting. This engine received platform-specific tuning for the 350SD variant-and from 1998 was phased out in favour of the OM612 inline-five. All adaptations are documented in OEM technical bulletins.
Locate the engine number stamped horizontally on the front-right side of the engine block near the timing cover (Mercedes-Benz TIS 602.982-2001). The 8th VIN digit indicates engine type ('D' for diesel, '6' for 3.0L). Pre-1996 units have a ribbed valve cover; post-1996 revisions use a flat cover. Critical differentiation from OM602.911: OM 602.982 includes a KKK turbocharger and intercooler piping. Service parts require model-year verification—pump calibration differs between W124 and W140 applications (Mercedes-Benz SIB 70.00-P-0004/0).
The OM 602.982's primary reliability risk is injection pump timing degradation, with elevated incidence in high-mileage or intermittently used vehicles. Internal Mercedes-Benz field reports from 1999 indicated a significant number of OM602.982 units required pump recalibration or replacement before 250,000 km, while VCA records show these engines are among the most durable in long-term fleet use when properly maintained. Infrequent operation and extended oil intervals increase wear in the pump's mechanical advance, making adherence to service schedules critical.
Analysis derived from Mercedes-Benz technical bulletins (1995-2000) and UK DVSA failure statistics (2000-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ OM602982.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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