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 V…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The V9X 791 is generally robust when maintained properly, but early units (2010–2014) are prone to fuel pump coupling failure. Post-2014 revisions improved reliability. Using correct RN0720 oil, quality diesel, and avoiding constant high-load operation significantly enhances longevity.
Top issues include high-pressure fuel pump coupling failure, twin-turbo actuator sticking, EGR cooler leaks, and DPF regeneration failures. These are documented in Renault service bulletins RSB‑FUEL‑2013‑05 and RSB‑TURBO‑2014‑11, especially in towing or fleet applications.
The V9X 791 powers the Laguna III GT, Latitude, and Vel Satis from 2010–2015, all in dCi 240 form. It was also used in the Nissan Murano (2011–2014). Euro 6-compliant versions (2015–2018) added AdBlue and are found in limited export models.
Yes—ECU remapping can safely yield +25–30 kW on stock hardware due to conservative factory calibration. However, tuning increases stress on the fuel pump coupling and turbos, so supporting upgrades (fuel system, intercooler) are strongly recommended.
Official NEDC combined is ~6.8 L/100km (~42 mpg UK). Real-world mixed driving typically achieves 7.5–9.0 L/100km (31–38 mpg UK), depending on model and driving style. Highway efficiency exceeds 6.0 L/100km.
Yes. The V9X series is an interference design. Timing chain failure—though rare due to dual front-mounted chains—could cause piston-to-valve contact and catastrophic damage. No widespread chain issues reported.
Renault specifies RN0720-compliant 5W‑30 synthetic oil (ACEA C3). This low-SAPS formulation protects the DPF and SCR system. Change every 20,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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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
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