The Renault M9R 857 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2013 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 120 kW (163 PS) and torque figures between 340–360 Nm.
Fitted to models such as the Mégane III/IV, Scénic III/IV, and Talisman, the M9R 857 was engineered for responsive low…
All production years (2013–2018) meet Euro 6 standards across all markets (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 857 is a 1,995 cc inline‑four turbo‑diesel engineered for compact and mid‑size platforms (2013–2018). 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 6 standards universally, it integrates SCR aftertreatment and 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 | 110–120 kW (150–163 PS) | |
Torque | 340–360 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6 (2013–2018) | |
Compression ratio | 15.5:1 | |
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 | 170 kg |
The Renault M9R 857 was used across Renault's Mégane III/IV and Scénic III/IV platforms with transverse mounting and co-developed with Nissan for shared CMF‑C/D applications. This engine received platform-specific adaptations—revised cooling in the Talisman and AdBlue tank integration in all variants—and from 2013 the Euro 6 variants adopted SCR aftertreatment with Bosch CP4.2 injection, creating interchange limits. Partnerships enabled Nissan's dCi 150/160 engines to share core architecture. All adaptations are documented in OEM technical bulletins.
The M9R 857's primary reliability risk is dual-mass flywheel degradation, with elevated incidence in stop-start urban use and frequent towing. Renault internal data from 2015 indicated over 25% of pre-2014 engines required flywheel replacement before 130,000 km, while UK DVSA MOT records show AdBlue/SCR system faults rising in high-mileage examples. Extended oil intervals and low-quality diesel accelerate CP4.2 pump wear, making fuel quality and service adherence critical.
Analysis derived from Renault technical bulletins (2013–2018) 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 857 offers strong torque and Euro 6 compliance, but early models (2013–2014) suffer from dual-mass flywheel and CP4.2 pump issues. Post-2014 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 CP4.2 fuel pump wear, AdBlue/SCR system faults, and EGR cooler leaks. These are documented in Renault service bulletins RSB‑12‑045 and RSB‑13‑018. Urban driving and poor maintenance accelerate these failures.
The M9R 857 powered the Mégane III/IV, Scénic III/IV, and Talisman from 2013–2018. It was also used by Nissan in Qashqai and X-Trail as the dCi 150. Output ranged from 150 to 163 PS across applications, all meeting Euro 6 standards.
Yes. Stage 1 ECU remaps typically yield +15–25 kW safely due to robust internals. Higher stages require upgraded turbo, intercooler, and clutch. However, tuning increases stress on the CP4.2 pump and flywheel—supporting modifications and maintenance are essential.
In a Mégane dCi 150, expect ~5.5 L/100km city and ~4.0 L/100km highway, or ~58 mpg UK combined. Real-world mixed driving typically returns 50–60 mpg (UK). Economy drops significantly with DPF/AdBlue 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, SCR, and turbo. Change every 15,000 km or annually—whichever comes first.
Comprehensive technical documentation and regulatory references
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