The Renault M9R 866 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2018 and 2024. Developed under the Renault–Nissan–Mitsubishi Alliance, it features a high — pressure common‑rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Power output is rated at 130 kW (177 PS), with peak torque of 380 Nm delivered between 2,000 and 2,500 rpm, providing strong low‑rpm pulling power ideal for urban and motorway driving.
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All production years (2018–2024) meet Euro 6d-Temp (2018–2020) and Euro 6d (2021–2024) standards .
The Renault M9R 866 is a 1,995 cc inline‑four turbo‑diesel engineered for mid‑size and large passenger vehicles (2018–2024). It combines Bosch CP4.2 common‑rail injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and refined highway cruising. Designed to meet Euro 6d-Temp and Euro 6d emissions standards from launch, it integrates AdBlue SCR, EGR, and DPF systems to balance performance with stringent regulatory compliance.
| 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 | 130 kW (177 PS) | |
Torque | 380 Nm @ 2,000–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) with AdBlue SCR | |
Emissions standard | Euro 6d-Temp (2018–2020); Euro 6d (2021–2024) | |
Compression ratio | 15.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett or BorgWarner) | |
Timing system | Chain (front‑mounted; durable design) | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 168 kg |
The Renault M9R 866 was used across Renault's Talisman, Mégane IV, Scénic IV, Espace V, and Koleos II platforms with transverse mounting and co-developed with Nissan for shared applications. This engine received platform-specific adaptations—reinforced engine mounts in the Espace V and revised exhaust manifolds in the Talisman—and all variants integrate AdBlue SCR from launch, creating strict interchange limits with pre-Euro 6d M9R engines. Partnerships enabled Nissan to use the same block in the Qashqai II, X-Trail II, and Navara. All adaptations are documented in OEM technical bulletins.
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The M9R 866 offers strong performance and full Euro 6d compliance, but early models (2018–2019) are prone to high-pressure fuel pump failures if poor-quality diesel is used. Later revisions (2020+) improved pump durability. Regular oil changes using RN0720 5W-30, strict adherence to EN 590 diesel, and timely AdBlue refills greatly extend engine life.
Top issues include Bosch CP4.2 fuel pump failure, AdBlue system faults (dosing valve clogging, NOx sensor errors), EGR cooler clogging, and turbo actuator sticking. These are well-documented in Renault service bulletin RNT/2019/07, especially in high-mileage or poorly maintained vehicles.
The M9R 866 powered the Talisman, Mégane IV, Scénic IV, Espace V, and Koleos II from 2018–2024. It was also used by Nissan in the Qashqai II, X-Trail II, and Navara under joint development. All variants produce 177 PS and include AdBlue SCR for Euro 6d compliance.
Aftermarket ECU tuning is common on the M9R-866 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.
In a Mégane IV 2.0 dCi 177, expect ~5.9 L/100km (city) and ~4.6 L/100km (highway), or ~48 mpg UK combined. Real-world mixed driving typically returns 44–51 mpg (UK), depending on model, driving style, and AdBlue system health.
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 front-mounted chain is generally durable with proper oil maintenance.
Renault specifies 5W-30 synthetic oil meeting RN0720 (low-SAPS) standard. This protects the DPF, SCR catalyst, and turbo. Change every 20,000 km or 12 months—whichever comes first—to prevent sludge and fuel pump wear.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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Official guidance on engine swaps and inspection implications.
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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.
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