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 manoe…
Production years 2007–2011 meet Euro 4 standards .
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 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.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
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 M5M 450 can be reliable with meticulous maintenance, but it has a known weakness in its high-pressure fuel pump. Longevity heavily depends on using pristine fuel and the correct RN0700 oil. Addressing EGR issues promptly and adhering to service intervals greatly improves its chances of reaching high mileage without major failure.
The most frequent issues are high-pressure fuel pump failure, EGR system clogging, turbocharger actuator faults, and glow plug failures. Fuel pump problems are often linked to poor fuel quality, while EGR issues stem from the engine's operating cycle. These are covered in Renault service documentation.
The M5M 450 engine was used in the Renault Clio III (2007-2011) and the Renault Twingo II (2007-2011), specifically in the dCi 90 variants. It was not used in any other Renault models or licensed to other manufacturers during its production run.
Aftermarket ECU tuning is common on the M5M-450 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.
Excellent for its era. In a Renault Clio III dCi 90, expect real-world figures of approximately 5.0 L/100km (city) and 3.8 L/100km (highway), translating to roughly 56 mpg UK combined. Its small displacement and focus on low-end torque make it very economical for urban and mixed driving.
Yes. The M5M 450 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing significant and expensive internal engine damage. Fortunately, the chain is generally robust if serviced correctly.
Renault mandates the use of RN0700 specification oil, typically a 5W-30 synthetic. Using this specific oil is crucial for protecting the high-pressure fuel pump and ensuring proper lubrication of the turbocharger and timing chain. Always change the oil at the recommended 15,000 km intervals.
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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