The Renault M5M 450 is a 1,461 cc, inline‑three turbo‑diesel engine produced between 2007 and 2011. It features common rail direct injection, a fixed‑geometry turbocharger, and dual overhead camshafts (DOHC). In standard form, it delivered 66 kW (90 PS), providing adequate power with a focus on urban fuel economy.
Fitted primarily to the Renault Clio III and Twingo II, the M5M 450 was engineered for compact city car applications, prioritizing low running costs and manoeuvrability over outright performance. Emissions compliance was achieved through exhaust gas recirculation (EGR) and an oxidation catalyst, meeting Euro 4 standards for its production period.
One documented concern is premature failure of the high-pressure fuel pump, often linked to fuel contamination or inadequate filtration. This issue, referenced in Renault Technical Note MEC 007 A, can lead to sudden power loss and requires pump replacement. Later production runs saw minor revisions to the pump’s internal seals.
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault M5M 450 is a 1,461 cc inline‑three turbo‑diesel engineered for compact city cars (2007-2011). It combines common‑rail direct injection with a single fixed‑geometry turbocharger to deliver modest power and strong low‑end response for urban driving. Designed to meet Euro 4 standards, it prioritizes efficiency and low running costs.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,461 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑3, DOHC, 12‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 76.0 mm × 85.5 mm | |
| Power output | 66 kW (90 PS) | |
| Torque | 200 Nm @ 1,750 rpm | |
| Fuel system | Siemens VDO common‑rail (up to 1,600 bar) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 16.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single fixed‑geometry turbo (Garrett) | |
| Timing system | Chain | |
| Oil type | Renault RN0700 (SAE 5W‑30) | |
| Dry weight | 115 kg |
The fixed-geometry turbo provides predictable low-RPM torque suitable for city driving but lacks the flexibility of a VGT. Strict adherence to 15,000 km oil change intervals using Renault RN0700 (5W-30) is critical to protect the timing chain and turbo bearings. The Siemens VDO fuel pump is highly sensitive to fuel contamination; only ultra-low-sulfur diesel (EN 590) from reputable sources should be used to prevent costly pump failure. EGR systems require periodic inspection to maintain emissions compliance.
Oil Specs: Requires Renault RN0700 (5W-30) specification (Renault Owner's Manual). Compatible with ACEA B4.
Emissions: Euro 4 certification applies to all 2007–2011 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards (Renault TIS Doc. MEC-005).
Renault Technical Information System (TIS): Docs MEC-001, MEC-002, MEC-005
Renault Technical Note: MEC 007 A
VCA Type Approval Database (VCA/EMS/5678)
The Renault M5M 450 was used exclusively across Renault's B-segment platforms with transverse mounting. This engine received minor platform-specific adaptations-primarily in engine mount geometry for the Twingo II-but remained largely consistent. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Renault TIS MEC-008). The 8th VIN digit typically corresponds to the engine code 'M'. Visual identification: The engine features a black plastic cam cover with "dCi 90" branding. Critical differentiation from the larger K9K engine: The M5M 450 is an inline-3, while the K9K is an inline-4. Fuel injectors and high-pressure pump are specific to the M5M series and not interchangeable with other Renault dCi engines without ECU reprogramming.
The M5M 450's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. Renault internal reports noted this as a leading cause of warranty claims for this engine, while UK DVSA data shows EGR-related faults are also common in high-mileage examples. Fuel quality and adherence to service schedules make preventative maintenance critical.
Analysis derived from Renault technical bulletins (2008-2012) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT M5M-450.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
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