The Renault K4M 791 is a 1,598 cc, inline‑four petrol engine produced between 2008 and 2018. It features a dual overhead camshaft (DOHC) layout with 16 valves and multi‑point fuel injection. In standard form, it delivered 81 kW (110 PS) and 151 Nm of torque, offering a refined balance of urban agility and relaxed highway cruising.
Fitted to models such as the Clio III, Mégane III, and Scénic III, the K4M 791 was engineered for responsive daily driving with an emphasis on fuel ef…
Production years 2008–2010 meet Euro 4 standards; 2011–2018 models meet Euro 5 compliance depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Renault K4M 791 is a 1,598 cc inline‑four petrol engine engineered for compact hatchbacks and MPVs (2008-2018). It combines multi‑point fuel injection with a DOHC 16‑valve head to deliver smooth, linear power delivery and efficient cruising. Designed to meet Euro 4 and Euro 5 standards, it balances everyday performance with improved environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 79.5 mm × 80.5 mm | |
Power output | 81 kW (110 PS) @ 5,750 rpm | |
Torque | 151 Nm @ 3,750 rpm | |
Fuel system | Multi‑point fuel injection (Siemens) | |
Emissions standard | Euro 4 (2008–2010); Euro 5 (2011–2018) | |
Compression ratio | 9.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven | |
Oil type | Renault RN0700 (SAE 5W‑40) | |
Dry weight | 112 kg |
The Renault K4M 791 was used across Renault's B/C‑segment platforms with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Scénic III and revised intake manifolds for the Mégane III-creating minor service part variations. All adaptations are documented in OEM technical bulletins.
The K4M 791's primary reliability risk is ignition coil failure, with elevated incidence in high-mileage or humid environments. Renault internal service data indicated a notable number of coil replacements under warranty, while owner reports frequently cite thermostat housing leaks as a secondary concern. Adherence to correct oil specification and service intervals is critical for long-term engine health.
Analysis derived from Renault technical bulletins (2008-2018) and owner-reported failure data (2010-2023). 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 K4M 791 is generally very reliable with a simple, chain-driven design. Its main weaknesses are ignition coil packs and plastic coolant components. With strict adherence to oil changes using RN0700 5W-40 and timely replacement of coils and thermostat housings, it can easily surpass 250,000 km. It is considered more refined than its predecessor, the K4M 745.
The most frequent issues are ignition coil pack failure, coolant leaks from the plastic thermostat housing, and oil leaks from the rocker cover gasket. A less common but notable issue is the Variable Valve Timing (VVT) solenoid becoming clogged or failing, leading to performance issues.
The K4M 791 1.6L 16V petrol engine was used in the Renault Clio III (2008-2012), Mégane III (2008-2015), Scénic III (2009-2015), and Kangoo (2008-2018). It was also found in some Dacia models like the Logan and Sandero during overlapping production periods.
Yes, but gains are modest. A simple ECU remap can yield an extra 8-12 kW. More significant power increases require camshaft upgrades, a performance exhaust, and intake modifications. The bottom end is strong, but the standard camshafts and VVT system are limiting factors for serious tuning.
Real-world fuel economy is good. Expect around 7.2 L/100km (39 mpg UK) in mixed driving for a Mégane III. In a lighter Clio III, figures can drop to 6.5 L/100km (43 mpg UK). Highway cruising can return 5.3 L/100km (53 mpg UK).
Yes. The K4M 791 is an interference engine. If the timing chain were to fail catastrophically (which is rare), the pistons would collide with the valves, causing severe internal engine damage. Fortunately, the chain is very durable.
Renault specifies a 5W-40 synthetic oil meeting the RN0700 standard. Using this specific oil is crucial for protecting the engine's internals, including the VVT system. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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