The Renault M9R 812 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 2006 and 2018. Developed jointly with Nissan, it features a common rail direct injection system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Output ranges from 110 kW (150 PS) to 130 kW (177 PS), with torque figures between 340 — 380 Nm.
Fitted to models like the Laguna III, Mégane III, and Scénic III, as well as Nissan equivalents (Qashqai, X — Trail), the M9R 8…
Production years 2006–2009 meet Euro 4 standards; 2010–2018 models meet Euro 5 compliance .
The Renault M9R 812 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size sedans and SUVs (2006-2018). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver smooth, accessible torque and efficient highway cruising. Designed to meet Euro 4 and Euro 5 standards, it balances performance with regulatory 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 | 110–130 kW (150–177 PS) | |
Torque | 340–380 Nm @ 2,000 rpm | |
Fuel system | Bosch CP4 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 4 (pre‑2010); Euro 5 (2010 onwards) | |
Compression ratio | 15.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 185 kg |
The Renault M9R 812 was used across Renault's Laguna/Mégane platforms with transverse mounting and co-developed with Nissan for shared platforms. This engine received platform-specific adaptations-different engine mounts for the Scénic and revised cooling for the Koleos-and from 2010 received ECU and emissions hardware updates for Euro 5 compliance, creating minor software interchange limits. The partnership resulted in Nissan's MR20DDT petrol engine sharing architecture. 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 812 is generally robust with strong torque, but its longevity heavily depends on maintenance and fuel quality. The primary concern is the HPFP, especially in early models. Post-2010 revisions improved reliability. Regular oil changes with RN0720 spec oil and using premium diesel are crucial for avoiding major issues.
The most frequent issues are high-pressure fuel pump (HPFP) failure, EGR valve/cooler clogging or leaking, and DPF regeneration problems leading to blockages. Turbo actuator faults are also common. These are well-documented in Renault service bulletins and owner reports.
The M9R 812 powered key Renault models like the Laguna III, Mégane III, Scénic III, and Koleos I from 2007-2016. It was also used in Nissan vehicles such as the Qashqai J10 and X-Trail T31, badged as the dCi 150 engine.
Aftermarket ECU tuning is common on the M9R-812 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 size. In a Laguna III dCi 150, expect around 6.5 L/100km (city) and 4.8 L/100km (highway), achieving roughly 47-52 mpg UK combined. Real-world figures vary with driving style, but 45-55 mpg UK is typical for mixed driving in good condition.
Yes. The M9R 812 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is front-mounted and generally very durable with proper maintenance.
Renault mandates the use of RN0720 specification oil, typically a 5W-30 synthetic. This specific formulation is designed to handle the soot and heat of a modern turbo-diesel and protect critical components like the turbo and timing chain. Always adhere to the 20,000 km service interval.
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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