The Renault M9R 746 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 2012 and 2018. It features a cast‑iron block, aluminum cylinder head, dual overhead camshafts (DOHC), and 16 valves. Power output is typically 130 kW (177 PS) with 380 Nm of torque, delivered via a common rail direct injection system and a variable‑geometry turbocharger.
Fitted to models like the Laguna III, Espace V, and Talisman, the M9R 746 was engineered for strong, refined performanc…
Production years 2012–2018 meet Euro 5 standards .
The Renault M9R 746 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size and large vehicles (2012-2018). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver strong, linear torque and improved efficiency. Designed to meet Euro 5 standards, it balances performance with stricter emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 88.0 mm × 90.0 mm | |
Power output | 130 kW (177 PS) | |
Torque | 380 Nm @ 1,750 rpm | |
Fuel system | Common rail direct injection (Bosch) | |
Emissions standard | Euro 5 | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Variable‑geometry turbo (Garrett) | |
Timing system | Chain‑driven | |
Oil type | Renault RN0710 (SAE 5W‑30) | |
Dry weight | 198 kg |
The Renault M9R 746 was used across Renault's Laguna/Espace platforms with transverse mounting. This engine received platform-specific adaptations-different engine mounts for the Talisman-and featured minor ECU updates for emissions compliance, though core mechanicals remained unchanged. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The M9R 746 is a powerful and efficient engine but has known issues with its high-pressure fuel pump and AdBlue system. With strict adherence to maintenance schedules, using RN0710 (5W-30) oil and high-quality diesel, the engine can be reliable. Proactive cleaning of the EGR system and timely AdBlue refills are crucial for long-term trouble-free operation.
The most frequent issues are high-pressure fuel pump failure, AdBlue system faults (clogged injectors, sensor failures), EGR valve clogging, and turbocharger actuator failure. These are well-documented in Renault service bulletins and are common repair items for diesel specialists working on Euro 5 vehicles.
The M9R 746 was used in the later models of the Renault Laguna III (2012-2015), and was the standard 2.2 dCi diesel engine for the Espace V (2015-2018) and Talisman (2015-2018). It represented the higher-output, Euro 5-compliant evolution of the M9R engine family.
Aftermarket ECU tuning is common on the M9R-746 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is very good for its power output. Expect around 7.5 L/100km (38 mpg UK) in mixed driving in a Talisman, and up to 5.5 L/100km (51 mpg UK) on a steady highway run. Combined figures typically range from 40-45 mpg UK, depending on the vehicle, driving style, and condition of the emissions systems.
Yes. The M9R 746 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing catastrophic internal engine damage. This highlights the importance of using the correct oil and addressing any timing chain noise immediately.
Renault mandates the use of RN0710 specification oil, typically a 5W-30 low-SAPS (low ash) synthetic. This specific oil is crucial for protecting the emissions systems (DPF, SCR) and the high-pressure fuel pump. Always change the oil and filter at the recommended intervals (typically 20,000 km or annually) to prevent sludge and component wear.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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