The Renault M9R 806 is a 2,299 cc, inline‑four turbo‑diesel engine produced between 2015 and 2021. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). This engine was designed to offer a blend of strong pulling power and improved fuel efficiency for Renault's larger SUVs and vans, with outputs typically ranging from 130 kW (177 PS) to 140 kW (190 PS) and torque figures of 380–400 Nm.
Fitted primarily to the K…
Production years 2015–2018 meet Euro 6b standards; 2019–2021 models comply with Euro 6d-Temp .
The Renault M9R 806 is a 2,299 cc inline‑four turbo‑diesel engineered for mid‑size SUVs and executive sedans (2015-2021). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver smooth, high-torque performance and efficient long-distance cruising. Designed to meet Euro 6b and Euro 6d-Temp standards, it balances power with stringent emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,299 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 88.0 mm × 94.6 mm | |
Power output | 130–140 kW (177–190 PS) | |
Torque | 380–400 Nm @ 1,750 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6b (2015-2018); Euro 6d-Temp (2019-2021) | |
Compression ratio | 15.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 195 kg |
The Renault M9R 806 was used across Renault's CMF-CD platform with transverse mounting. This engine received platform-specific adaptations-including revised engine mounts for the Koleos II and specific exhaust routing for the Talisman-and from 2019 received updates for Euro 6d-Temp compliance, creating minor ECU and sensor differences. All adaptations are documented in OEM technical bulletins.
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The M9R 806's primary reliability consideration is EGR cooler integrity in extreme cold, with documented cases in Nordic markets. Renault Technical Note MEC 02 18 A addresses this for affected regions, while general maintenance adherence ensures long-term durability. Neglecting oil changes or using incorrect fuel significantly increases the risk of DPF and injector issues.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 806 is generally robust with proper maintenance. Its main documented issue is EGR cooler condensation in very cold climates, addressed by a specific service bulletin. Regular oil changes with RN17 5W-30 and using quality fuel are critical for longevity, particularly for the DPF and fuel pump.
The most common issues are DPF clogging from short trips, potential EGR cooler failure in extreme cold (per Tech Note MEC 02 18 A), and wear in the high-pressure fuel pump. Turbo actuator failures are also a known, though less frequent, concern.
The M9R 806 was used in the second-generation Renault Koleos (2016-2021) and the Renault Talisman sedan (2015-2020). It was typically badged as dCi 160, dCi 175, or dCi 190, depending on the power output and model year.
Aftermarket ECU tuning is common on the M9R-806 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.
Official combined figures range from 5.5 to 6.0 L/100km (approx. 47-51 mpg UK), depending on the model and drivetrain. Real-world mixed driving typically yields 6.5-7.5 L/100km (38-43 mpg UK), with highway driving being significantly more efficient.
Yes. The M9R 806 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is very durable with proper oil maintenance.
Renault mandates the use of RN17 specification 5W-30 synthetic oil. Using this specific oil is non-negotiable for protecting the engine, turbocharger, and ensuring the DPF functions correctly. Change intervals should not exceed 20,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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