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-end torque, fuel-efficient cruising, and compliance with Euro 6 emissions standards. Emissions control was achieved through cooled exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling full Euro 6 certification across all markets.
One documented concern is premature wear of the dual-mass flywheel and clutch assembly, highlighted in Renault Service Bulletin RSB‑12‑045. This issue is often linked to thermal stress and torque spikes during frequent gear changes. From 2014, Renault introduced revised flywheel materials and updated clutch kits to mitigate failure rates.
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 M9R 857 delivers smooth torque delivery ideal for motorway cruising but requires strict adherence to 15,000 km oil change intervals using Renault RN0720 (5W‑30 ACEA C3) to protect the high-pressure fuel system and turbo bearings. The Bosch CP4.2 pump is highly sensitive to fuel contamination—only ultra-low-sulfur diesel (EN 590) should be used. AdBlue consumption averages 1.5–2.0 L per 1,000 km; low fluid levels disable restart. Dual-mass flywheel failures are common after 120,000 km; post-2014 models use improved components per RSB‑12‑045.
Oil Specs: Requires Renault RN0720 (5W‑30, ACEA C3) specification (Renault SIB RSB‑11‑033). Not interchangeable with non-C3 oils.
Emissions: Euro 6 certification applies universally to all 2013–2018 M9R 857 engines (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ISO 1585 standards. 120 kW output requires EN 590 diesel with sulfur <10 ppm (Renault TIS M9R‑A120).
Renault Technical Information System (TIS): Docs M9R‑A112, M9R‑A115, M9R‑A122, RSB‑13‑018, RSB‑11‑033, RSB‑12‑045
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Renault TIS M9R‑A105). The 7th and 8th VIN digits indicate engine variant ('85' for M9R 857). All units feature black cam covers and an AdBlue tank under the boot floor. Critical differentiation from M9R 845: M9R 857 uses Bosch EDC17C74 ECU with CP4.2 pump and SCR system. Flywheel part numbers differ before/after 2014—verify via production date (RSB‑12‑045).
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.
Find answers to most commonly asked questions about RENAULT M9R-857.
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