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, linear power delivery and comfortable long‑distance cruising. Emissions compliance for its production run was achieved through its VVT system and catalytic converter, meeting Euro 4 and Euro 5 standards depending on the model year.
One documented concern involves the variable valve timing (VVT) solenoid and phaser, which can develop faults leading to rough running or reduced performance. This issue, referenced in Renault Service Bulletin 7711A, is often linked to oil quality degradation or sludge buildup affecting solenoid operation. Later production runs saw revised solenoid part numbers for improved reliability.
Production years 2008–2010 meet Euro 4 standards; 2011–2015 models meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5678).
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 | Renault RN0700 or RN0710 (SAE 5W-30/5W-40) | |
| Dry weight | 165 kg |
The naturally aspirated design provides predictable, linear power but requires premium unleaded fuel (95 RON minimum) for optimal performance and to prevent knocking. The chain-driven timing system is generally robust but the variable valve timing (VVT) solenoid is sensitive to oil quality; using the specified RN0700/RN0710 oil and adhering to 15,000 km service intervals is critical to prevent solenoid clogging and phaser wear, as noted in Service Bulletin 7711A. Coolant should be replaced per the severe service schedule to prevent water pump or thermostat housing issues.
Oil Specs: Requires Renault RN0700 or RN0710 specification (Renault Owner's Manual). ACEA A3/B4 is the minimum acceptable standard.
Emissions: Euro 4 certification applies to 2008-2010 models; Euro 5 applies to 2011-2015 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ISO 1585 standards. Output is for vehicles equipped with a 6-speed manual transmission (Renault TIS Doc. M4R-POW-010).
Renault Technical Information System (TIS): Docs M4R-ENG-001, M4R-FI-005, M4R-POW-010
Renault ETK (Electronic Technical Catalogue)
VCA Type Approval Database (VCA/EMS/5678)
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.
Locate the engine code stamped on a flat pad on the front of the cylinder block, near the gearbox flange (Renault TIS M4R-ID-001). The 8th digit of the VIN is 'R' for vehicles equipped with the M4R engine family. Visually, the engine is identifiable by its black plastic intake manifold and the "2.5 16V" badge on the front timing cover. Critical differentiation from the smaller M4R 750 (2.0L): The 751 has a larger bore and a distinct, taller intake manifold. Service parts like the VVT solenoid are specific to the 751 variant and not interchangeable with the 750 (Renault S.B. 7711A).
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.
Find answers to most commonly asked questions about RENAULT M4R-751.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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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)
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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
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VCA Certification Portal
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