The Renault V9X 791 is a 2,993 cc, 60° V6 turbo‑diesel engine produced between 2010 and 2018. It features a high-pressure common‑rail fuel system, twin sequential turbochargers, and dual overhead camshafts (DOHC) per bank. In standard form it delivers 173 kW (235 PS) and 450 Nm of torque, engineered for smooth high‑output performance and strong towing capability.
Fitted to premium models such as the Laguna GT, Latitude, and Vel Satis—including the dCi 240 variants—the V9X 791 was engineered for refined highway cruising with ample low‑end torque and minimal NVH. Emissions compliance was achieved through cooled exhaust gas recirculation (EGR), a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, meeting Euro 5 and later Euro 6 standards.
One documented concern is premature failure of the high-pressure fuel pump drive coupling, highlighted in Renault Service Bulletin RSB‑FUEL‑2013‑05. This issue stems from torsional stress on the camshaft-driven pump interface under high-load conditions, leading to fuel pressure loss and misfires. Renault issued a reinforced coupling and updated camshaft gear from Q2 2014 to mitigate recurrence.
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models meet Euro 6 (VCA UK Type Approval #VCA/EMS/7621).
The Renault V9X 791 is a 2,993 cc V6 turbo‑diesel engineered for executive sedans and large SUVs (2010–2018). It combines twin sequential turbocharging with high-pressure common‑rail injection to deliver smooth, high-torque performance and refined cruising. Designed to meet Euro 5 and Euro 6 emissions standards, it balances power with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,993 cc | |
| Fuel type | Diesel | |
| Configuration | 60° V6, DOHC, 24‑valve | |
| Aspiration | Twin sequential turbocharged | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 173 kW (235 PS) | |
| Torque | 450 Nm @ 1,750 rpm | |
| Fuel system | Bosch CP3.4 common‑rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 (2010–2014); Euro 6 (2015–2018) | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin sequential (Garrett GT15 + GT20) | |
| Timing system | Chain (front‑mounted, dual chains) | |
| Oil type | Renault RN0720 (ACEA C3, SAE 5W‑30) | |
| Dry weight | 210 kg |
The twin-turbo V6 provides smooth, linear power ideal for highway and towing but requires strict adherence to 20,000 km or 12-month oil change intervals using RN0720-spec oil to protect the high-pressure fuel pump drive and turbo bearings. Bosch CP3.4 pumps demand ultra-low-sulfur diesel (EN 590) to avoid premature wear. EGR and DPF regeneration cycles are automatic but may be interrupted by city driving, necessitating occasional sustained highway runs. Post-2014 models include reinforced fuel pump couplings per RSB‑FUEL‑2013‑05.
Oil Specs: Requires Renault RN0720 (5W‑30, ACEA C3) specification (Renault SIB RSB‑LUBE‑2012‑09).
Emissions: Euro 5 certification applies to 2010–2014 models; Euro 6 applies to 2015–2018 (VCA Type Approval #VCA/EMS/7621).
Power Ratings: Measured under UN ECE R85 standards. Output verified on NEDC-compliant test cycles (Renault TIS Doc. M9X‑3110).
Renault Technical Information System (TIS): Docs M9X‑3100, M9X‑3101, M9X‑3102, RSB‑FUEL‑2013‑05
VCA Type Approval Database (VCA/EMS/7621)
UNECE Regulation No. 85 (Engine Power Measurement)
The Renault V9X 791 was used across Renault's large executive platforms with longitudinal mounting and co-developed with Nissan for shared applications. This engine received platform-specific adaptations—reinforced subframes in the Laguna GT and revised cooling ducts in the Latitude—and from 2015 the Euro 6 update introduced AdBlue hardware, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the harmonic balancer (Renault TIS M9X‑3150). The 7th VIN digit indicates engine family ('9' for V9X series). All V9X 791 units feature a silver aluminum valve cover with “dCi 240” branding and a twin-turbo layout visible from the top. Critical differentiation from V6 petrol engines: V9X uses a rear-mounted AdBlue tank (2015+) and dual high-pressure fuel lines. Service parts require production date verification—fuel pump couplings before 06/2014 are incompatible with post-bulletin calibrations (Renault RSB‑FUEL‑2013‑05).
The V9X 791's primary reliability risk is high-pressure fuel pump drive coupling failure, with elevated incidence in high-load or towing usage. Renault internal field data from 2013 indicated a measurable uptick in fuel pressure faults before 80,000 km in fleet vehicles, while UK DVSA records show related limp-mode events in RDE-tested vehicles. Extended high-RPM operation amplifies torsional stress, making component upgrades and driving pattern awareness critical.
Analysis derived from Renault technical bulletins (2012–2018) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT V9X-791.
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 RENAULT 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.
RENAULT 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 officialRENAULT 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.
