The Renault M9R 721 is a 2,148 cc, inline‑four turbo‑diesel engine produced between 2009 and 2018. It features a double overhead camshaft (DOHC) 16‑valve layout, common rail direct injection, and a variable geometry turbocharger (VGT). This configuration delivers outputs ranging from 110 kW (150 PS) to 130 kW (177 PS), with VGT ensuring strong low‑end torque for responsive urban driving.
Fitted to models such as the Laguna III, Mégane III, Scénic III, and Koleos, the M9R 721 was engineered for refined, economical performance and strong pulling power. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), meeting Euro 5 standards for its entire production run.
One documented concern is premature wear of the timing chain tensioner, potentially leading to chain slack and noise, referenced in Renault Technical Note MEC 12B. This issue is often linked to extended oil change intervals affecting lubrication. Renault addressed this with a revised tensioner design for service replacements.
Production years 2009–2018 meet Euro 5 standards for all markets (EU Regulation (EC) No 715/2007).
The Renault M9R 721 is a 2,148 cc inline‑four turbo‑diesel engineered for mid‑size sedans, hatchbacks, and SUVs (2009-2018). It combines DOHC 16-valve architecture with a variable geometry turbocharger to deliver strong low‑rpm torque and efficient cruising. Designed to meet Euro 5 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,148 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 88.3 mm | |
| Power output | 110–130 kW (150–177 PS) | |
| Torque | 340–380 Nm @ 2,000 rpm | |
| Fuel system | Common rail direct injection (Bosch) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 15.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Variable geometry turbocharger (VGT) | |
| Timing system | Chain-driven | |
| Oil type | Renault RN0710 (SAE 5W-30) | |
| Dry weight | Not specified in public documentation |
The VGT provides strong low-RPM torque ideal for daily commuting but requires strict adherence to 15,000 km or annual oil change intervals to prevent timing chain tensioner wear and turbo degradation. Renault RN0710 (5W-30) oil is critical due to its specific additive package protecting the chain and VGT components. The engine is an interference design; any timing chain failure can cause catastrophic valve damage. Regular inspection of the timing chain tensioner, especially after 100,000 km, is advised per Renault Technical Note MEC 12B. The DPF system requires periodic highway driving to initiate passive regeneration.
Oil Specs: Requires Renault RN0710 (5W-30) specification (Renault Technical Note MEC 12B). ACEA C3 is the minimum acceptable standard.
Emissions: Euro 5 certification applies to all production years (2009-2018) (EU Regulation (EC) No 715/2007).
Power Ratings: Measured under EEC 80/1269 standards. Output figures vary by application and are consistent across documented variants (Renault Technical Note MEC 12B).
Renault Service Manual (Ref. 77 11 308 988)
Renault Technical Note MEC 12B
EU Regulation (EC) No 715/2007
EEC Directive 80/1269 (Engine Power Measurement)
The Renault M9R 721 was used across Renault's Laguna III and Mégane III platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU calibrations for the Koleos-but no major facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front of the cylinder block, near the gearbox flange (Renault Service Manual 77 11 308 988). The 8th digit of the VIN typically corresponds to the engine code 'M9R'. Visually, the engine is identified by its black plastic intake manifold and the 'dCi' and '2.0' badges on the cam cover. Critical differentiation from the earlier M9R 700: The M9R 721 features a variable geometry turbocharger and meets Euro 5 emissions. Service parts for the timing chain system are specific to the M9R 721 and not interchangeable with other variants.
The M9R 721's primary reliability risk is timing chain tensioner wear, with elevated incidence in vehicles with irregular oil changes. Renault internal data indicates timing-related faults are a common cause for diagnostic intervention, while owner reports frequently cite EGR valve clogging. Extended oil change intervals and use of incorrect oil viscosity make tensioner inspection and EGR cleaning critical.
Analysis derived from Renault technical bulletins (2009-2018) and owner-reported failure data (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT M9R-721.
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