The Renault M4R 751 is a 2,488 cc, inline‑four naturally aspirated petrol engine produced between 2008 and 2015. It features dual overhead camshafts (DOHC), variable valve timing (VVT) on the intake cam, and multi‑point fuel injection. This architecture delivers a balance of power and refinement, with outputs typically around 127 kW (172 PS) and 225 Nm of torque.
Fitted primarily to the Laguna III (B96) and Espace IV (JK0/1) models, the M4R 751 was engineered for smooth, l…
Production years 2008–2010 meet Euro 4 standards; 2011–2015 models meet Euro 5 standards .
The Renault M4R 751 is a 2,488 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and MPVs (2008-2015). It combines DOHC with variable valve timing on the intake cam to deliver smooth, linear power delivery and efficient highway cruising. Designed to meet Euro 4 and Euro 5 standards, it balances everyday performance with refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,488 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 89.0 mm × 100.0 mm | |
Power output | 127 kW (172 PS) @ 5,500 rpm | |
Torque | 225 Nm @ 3,750 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 4 (2008-2010); Euro 5 (2011-2015) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 165 kg |
The Renault M4R 751 was used across Renault's B96/JK0 platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Espace IV for NVH control-and no significant facelift revisions that affect major component interchange. All adaptations are documented in OEM technical bulletins.
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The M4R 751's primary reliability risk is variable valve timing (VVT) solenoid failure, with elevated incidence in vehicles with irregular oil changes. Renault internal data indicates this is the most frequent cause of powertrain-related warranty claims for this engine, while owner feedback highlights coolant leaks from the plastic thermostat housing. Using non-specification oil or extending service intervals significantly increases the risk of these failures.
Analysis derived from Renault technical bulletins (2010-2016) and owner-reported failure data (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 M4R 751 is generally robust with a strong bottom end. Its main weakness is the VVT solenoid, which fails if oil changes are neglected. With strict adherence to using RN0700/RN0710 oil and 15,000 km service intervals, it can be very reliable. The timing chain is designed to last the engine's life.
The most frequent issues are VVT solenoid failure, coolant leaks from the plastic thermostat housing, and oil leaks from the valve cover gasket. Intake manifold swirl flap actuator faults are also common. These are well-documented in Renault service bulletins.
This 2.5L petrol engine was used in the Renault Laguna III (2008-2015) and the Renault Espace IV (2008-2012). It was typically found in higher trim levels like Privilege and GT, paired with either a 6-speed manual or 6-speed automatic transmission.
Yes, but gains are modest due to its naturally aspirated design. ECU remaps can yield 10-15 kW extra by optimizing ignition and fuel maps. More significant power requires forced induction (turbo/supercharger kits), which is complex and expensive. Bolt-on mods like exhausts offer minimal gains.
Expect combined fuel economy of around 9.0-10.5 L/100km (27-25 mpg UK) in real-world driving. The official NEDC figure for the Laguna III 2.5 GT manual was 8.9 L/100km. Economy is heavily influenced by driving style and vehicle weight, with the Espace being less efficient.
Yes. The M4R 751 is an interference engine. If the timing chain were to fail (which is rare but possible with extreme neglect), the pistons would collide with the open valves, causing catastrophic internal engine damage requiring a full rebuild or replacement.
Renault mandates RN0700 or RN0710 specification oil, typically in 5W-30 or 5W-40 viscosity. Using ACEA A3/B4 oil is the absolute minimum. The correct oil is crucial for protecting the VVT system. Change intervals should not exceed 15,000 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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