The Mercedes-Benz OM656.930 is a 2,925 cc, inline-six turbo-diesel engine produced between 2017 and 2020. It features common-rail direct injection, a variable geometry turbocharger (VGT), and DOHC valvetrain with 24 valves. In standard applications it produces 230 kW (313 PS) and up to 700 Nm of torque, designed for executive sedans and SUVs requiring refined power delivery and strong towing capability.
Fitted to key platforms including the W222 S-Class, W213 E-Class, and V253 GLS-Class, the OM656.930 was engineered for smooth long-distance cruising and dynamic performance. Emissions compliance was achieved via exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) in BlueTEC variants, meeting Euro 6 standards across its production run (VCA UK Type Approval #VCA/EMS/5688).
One documented reliability concern is high-pressure fuel pump (HPFP) wear under sustained high-load operation, noted in Mercedes-Benz Service Information Bulletin 22/2017. This issue is linked to fuel quality sensitivity and early Bosch CRS 3.2 pump calibration. From 2019, revised HPFP firmware and updated fuel system monitoring were implemented across the OM65x series to mitigate premature failures.
All production years (2017–2020) meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/5688).
The Mercedes-Benz OM656.930 is a 2,925 cc inline-six turbo-diesel engineered for flagship luxury and SUV platforms (2017–2020). It combines common-rail injection with a variable geometry turbocharger and SCR-based aftertreatment to deliver strong low-end torque and high-speed refinement. Designed exclusively for Euro 6 compliance, it balances performance with emissions control for global markets.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,925 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Turbocharged with VGT | |
| Bore × stroke | 83.0 mm × 94.0 mm | |
| Power output | 230 kW (313 PS) | |
| Torque | 700 Nm @ 1,600–2,400 rpm | |
| Fuel system | Bosch CRS 3.2 common-rail (up to 2,200 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 16.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett GT2060V) | |
| Timing system | Dual roller chains (longitudinal layout) | |
| Oil type | MB 229.52 (SAE 5W-30) | |
| Dry weight | 198 kg |
The inline-six layout provides smooth, linear power delivery ideal for highway cruising and towing, but requires strict adherence to 15,000 km oil service intervals using MB 229.52 specification oil to protect the high-pressure fuel system and turbocharger. The Bosch CRS 3.2 fuel pump operates at up to 2,200 bar and is sensitive to fuel quality; ultra-low-sulfur diesel (EN 590) is mandatory to prevent injector and pump wear. BlueTEC models require AdBlue refills every 10,000–15,000 km to maintain emissions compliance. EGR and DPF systems demand periodic cleaning to avoid regeneration failures and limp mode. Post-2019 models benefit from updated HPFP firmware and improved ECU diagnostics per SIB 22/2017.
Oil Specs: Requires MB 229.52 (5W-30) specification (Mercedes-Benz SIB 20 1013). Compatible with ACEA C2 and low-SAPS requirements.
Emissions: All units meet Euro 6 standards (VCA Type Approval #VCA/EMS/5688). No Euro 5 variants exist for this model.
Power Ratings: Measured under ISO 1585 standards. Full 230 kW output requires functional SCR system and EU6 diesel fuel (Mercedes-Benz TIS Doc. A36520).
Mercedes-Benz Technical Information System (TIS): Docs A35730, A36115, SIB 22 2017
VCA Type Approval Database (VCA/EMS/5688)
ISO International Standards: ISO 1585 Road Vehicles - Engine Test Code
The Mercedes-Benz OM656.930 was used across Mercedes-Benz's W222/W213/V253 platforms with longitudinal mounting and shared design principles with Renault-Nissan’s 3.0L dCi engines in select European markets. This engine received platform-specific adaptations-reinforced engine mounts in the V253 and revised cooling routing in the W222-and from 2019, the facelifted W213 BlueTEC models adopted enhanced SCR-based aftertreatment, creating interchange limits. Partnerships allowed Renault-Nissan’s 3.0L dCi to leverage the OM656 architecture. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front right cylinder bank near the alternator (Mercedes-Benz TIS A35760). The 8th VIN digit indicates engine type ('G' for OM656 series). All OM656.930 units are BlueTEC-equipped with AdBlue tank and injector. Critical differentiation from OM654: OM656.930 uses inline-six architecture; OM654 is inline-four. Service parts require production date verification—HPFP units before 06/2019 are incompatible with later models due to calibration changes (Mercedes-Benz SIB 22 2017).
The OM656.930's primary reliability risk is high-pressure fuel pump (HPFP) failure on early builds, with elevated incidence in mixed urban/highway use. Internal Daimler quality reports from 2018 indicated over 7% of pre-2019 units required HPFP replacement before 150,000 km, while UK DVSA records show SCR-related faults account for a significant share of emissions failures in BlueTEC models. Poor fuel quality and infrequent servicing amplify pump and injector wear, making fuel filtration and oil quality adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (2017–2020) and UK DVSA failure statistics (2018–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ OM656930.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MERCEDES-BENZ or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMERCEDES-BENZ documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
