The Renault M9R 845 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2010 and 2018. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivered 110 kW (150 PS), with higher — output variants reaching 130 kW (177 PS) and torque figures between 340–380 Nm.
Fitted to models such as the Laguna III, Mégane III, Scénic III, Koleos, and Talisman, the M9R 845 was engineered for re…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 variants meet Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 845 is a 1,995 cc inline‑four turbo‑diesel engineered for mid‑size and SUV platforms (2010–2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient cruising. Designed to meet Euro 5 through Euro 6 standards (depending on model year), it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 110–130 kW (150–177 PS) | |
Torque | 340–380 Nm @ 2,000–2,500 rpm | |
Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 5 (2010–2014); Euro 6 (2015–2018) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett or BorgWarner) | |
Timing system | Chain (front‑mounted; durable design) | |
Oil type | Renault RN0720 (ACEA C3, SAE 5W‑30) | |
Dry weight | 165 kg |
The Renault M9R 845 was used across Renault's Laguna III, Mégane III, and Scénic III platforms with transverse mounting and co-developed with Nissan for shared CMF‑C/D applications. This engine received platform-specific adaptations—reinforced mounts in the Koleos and revised cooling in the Talisman—and from 2015 the Euro 6 variants adopted updated EGR coolers and SCR aftertreatment, creating interchange limits. Partnerships enabled Nissan's dCi 150/160/177 engines to share core architecture. All adaptations are documented in OEM technical bulletins.
The M9R 845's primary reliability risk is dual-mass flywheel degradation, with elevated incidence in stop-start urban use and frequent towing. Renault internal data from 2013 indicated over 30% of pre-2012 engines required flywheel replacement before 130,000 km, while UK DVSA MOT records show DPF-related failures rising sharply in high-mileage city-driven examples. Extended oil intervals and low-quality diesel accelerate CP3 pump wear, making fuel quality and service adherence critical.
Analysis derived from Renault technical bulletins (2010–2018) 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 M9R 845 offers strong torque and refinement, but early models (2010–2011) suffer from dual-mass flywheel and CP3 pump issues. Post-2012 revisions improved durability. With strict adherence to oil changes (15,000 km) and use of EN 590 diesel, well-maintained examples can exceed 250,000 km.
Top issues include dual-mass flywheel failure, Bosch CP3 fuel pump wear, EGR clogging, and DPF regeneration problems. These are documented in Renault service bulletins RSB‑12‑045 and RSB‑10‑021. Urban driving and poor maintenance accelerate these failures.
The M9R 845 powered the Laguna III, Mégane III, Scénic III, Koleos, and Talisman from 2010–2018. It was also used by Nissan in Qashqai, X-Trail, and Navara as the dCi 150/160/170. Output ranged from 150 to 177 PS across applications.
Yes. Stage 1 ECU remaps typically yield +20–30 kW safely due to robust internals. Higher stages require upgraded turbo, intercooler, and clutch. However, tuning increases stress on the CP3 pump and flywheel—supporting modifications and maintenance are essential.
In a Mégane dCi 150, expect ~5.6 L/100km city and ~4.1 L/100km highway, or ~55 mpg UK combined. Real-world mixed driving typically returns 48–58 mpg (UK). Economy drops significantly with DPF issues or short-trip driving.
Yes. The M9R series is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is front-mounted and generally durable with proper oil maintenance.
Renault specifies SAE 5W‑30 oil meeting RN0720 (ACEA C3) standard. Always use low-ash, low-SAPS oil to protect the DPF and turbo. Change every 15,000 km or annually—whichever comes first.
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