The Renault M9R 850 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 2013 and 2018. It features a twin‑scroll variable geometry turbocharger (VGT), Bosch common‑rail direct injection (up to 1,800 bar), and a dual overhead camshaft (DOHC) 16‑valve layout. Output is rated at 130 kW (177 PS) with peak torque of 380 Nm, delivering responsive performance and strong low‑rpm pull for everyday drivability.
Fitted to models including the Laguna III, Mégane III, S…
All production years (2013–2018) meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 850 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size sedans and SUVs (2013–2018). It combines Bosch common‑rail injection with a twin‑scroll variable‑geometry turbocharger to deliver responsive low‑end torque and highway refinement. Designed to meet Euro 5 emissions standards, it balances performance with fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (twin‑scroll VGT) | |
Bore × stroke | 88.0 mm × 90.0 mm | |
Power output | 130 kW (177 PS) | |
Torque | 380 Nm @ 1,750–2,750 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 5 | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin‑scroll VGT (Garrett or BorgWarner) | |
Timing system | Chain (front‑mounted; durable design) | |
Oil type | Renault RN0720 (ACEA C3, SAE 5W‑30) | |
Dry weight | 178 kg |
The Renault M9R 850 was used across Renault's Laguna III, Mégane III, and Koleos platforms with longitudinal mounting and shared with Nissan for transverse applications in European markets. This engine received platform-specific adaptations—reinforced mounts in the Koleos and revised EGR routing in the Scénic III—and from 2015 the facelifted Mégane III adopted updated fuel pump hardware, creating interchange limits. Partnerships allowed Nissan's dCi 180 variants to use identical M9R 850 units. All adaptations are documented in OEM technical bulletins.
The M9R 850's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using non-compliant oil or extended service intervals. Renault internal data from 2015 indicated a significant share of pre-2014 pumps failing before 100,000 km, while UK DVSA MOT records show DPF-related emissions faults rising in urban-driven examples. Short-trip driving and poor-quality diesel accelerate pump and EGR degradation, making oil specification and fuel quality critical.
Analysis derived from Renault technical bulletins (2013–2016) 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 850 offers strong performance and refinement, but pre-2015 models are prone to high-pressure fuel pump failures if not maintained properly. Using Renault RN0720 oil and adhering to 15,000 km service intervals greatly improves longevity. Post-2015 revisions enhanced pump durability, making later examples more robust.
Key issues include Bosch CP4.2 fuel pump failure, EGR cooler coolant leaks (pre-2014), DPF regeneration faults from short trips, and turbo actuator sticking. These are well-documented in Renault Service Bulletin 6014A and DVSA emissions data.
The M9R 850 powered the Laguna III, Mégane III, Scénic III, and Koleos from 2013–2018 in dCi 180 variants. Nissan also used it in the Qashqai (J10) and X-Trail (T31) as the dCi 180 engine during overlapping production years.
Yes. Stage 1 ECU remaps typically yield +20–30 kW safely, as the engine internals are robust. However, tuning increases stress on the CP4.2 pump and turbo, so supporting upgrades (oil cooler, high-flow fuel filter) are recommended to maintain reliability.
In a Mégane III dCi 180, expect ~6.2 L/100km city and ~4.6 L/100km highway, or ~48 mpg UK combined. Real-world mixed driving typically returns 42–50 mpg (UK), depending on driving style and DPF regeneration cycles.
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 design is generally durable with proper maintenance.
Renault specifies SAE 5W-30 oil meeting RN0720 (ACEA C3) standard. This low-SAPS formulation protects the DPF and ensures adequate lubrication for the high-pressure fuel pump. Never use non-approved oils.
Comprehensive technical documentation and regulatory references
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