The Dacia H4M 740 is a 1,330 cc, inline — four naturally aspirated petrol engine produced between 2018 and 2023. It features multi — point fuel injection (MPFI), dual overhead camshafts (DOHC), and 16 valves, delivering 66 kW (90 PS) at 5,500 rpm and 128 Nm of torque at 3,750 rpm. Developed as part of the Renault — Nissan — Mitsubishi Alliance's H4M engine family, it replaces the older H4M 430 with improved thermal efficiency and emissions control.
Fitted to models such as the Sa…
All production years (2018–2023) meet Euro 6d-TEMP standards .
The Dacia H4M 740 is a 1,330 cc inline-four petrol engine engineered for compact and subcompact models (2018–2023). It combines multi-point fuel injection with DOHC 16-valve architecture and a timing chain to deliver improved efficiency and reduced maintenance. Designed to meet Euro 6d-TEMP emissions standards, it balances cost-effective ownership with modern drivability and environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,330 cc | |
Fuel type | Petrol (Unleaded, 95 RON min) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.0 mm × 75.0 mm | |
Power output | 66 kW (90 PS) @ 5,500 rpm | |
Torque | 128 Nm @ 3,750 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing chain (lifetime service interval) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 106 kg |
The Dacia H4M 740 was used across Dacia's Sandero II, Logan II, and Duster platforms with transverse mounting and shared architecture with Renault models. This engine received platform-specific adaptations-shorter intake manifolds in the Sandero II and revised exhaust routing in the Duster-and from 2018 the facelifted Logan II adopted updated engine management software, creating minor calibration differences. All adaptations are documented in OEM technical bulletins.
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The H4M 740's primary reliability risk is intake manifold carbon buildup due to cooled EGR operation, with elevated incidence in urban-driven examples. Renault internal field reports from 2020 indicated a growing number of H4M 740 engines requiring intake cleaning beyond 70,000 km, while VCA MOT data shows increased DPF-related faults in early Euro 6d-TEMP units. Infrequent oil changes and low-octane fuel exacerbate valve train and combustion issues, making adherence to service intervals and fuel quality critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The H4M 740 is mechanically simple and durable when maintained properly. The timing chain eliminates belt replacement risk, and the engine is less prone to major mechanical failure than its predecessor. Regular oil changes, use of 95 RON fuel, and periodic EGR/intake cleaning ensure long-term reliability. No widespread structural issues have been reported in official Renault field data through 2023.
Key issues include intake carbon buildup due to cooled EGR system, throttle body coking, and water pump leaks. These are documented in Renault service bulletins and field reports. Unlike the H4M 430, there is no timing belt risk. ECU-related throttle faults may occur but are often resolved with cleaning and adaptation resets.
The H4M 740 was used in the Dacia Sandero II (2018–2023), Logan II (2018–2023), and Duster (2018–2023) in 1.3 16V naturally aspirated form. It was also used in the Renault Clio IV (2019–2022). All models meet Euro 6d-TEMP standards ().
Limited tuning potential exists due to naturally aspirated design and MPFI system. ECU remaps offer minimal gains (5–10%). More effective upgrades include performance air filters and exhaust systems, but these yield modest improvements. Forced induction conversion is complex and not OEM-supported. Best results come from meticulous maintenance and high-octane fuel.
In combined driving, the H4M 740 achieves approximately 6.0–6.8 L/100km (47–41 mpg UK). City driving may see 7.5 L/100km (38 mpg), while highway runs can reach 5.4 L/100km (52 mpg). Real-world consumption depends on driving style and vehicle weight. Duster models are slightly less efficient due to higher mass and drag.
Yes. The H4M 740 is an interference engine. If the timing chain fails or jumps timing, the pistons can contact open valves, resulting in bent valves or damaged pistons. Although the chain is designed for the life of the engine, severe neglect or manufacturing defects could lead to failure. Immediate attention to unusual noises is essential.
Renault specifies SAE 5W-30 oil meeting ACEA A5/B5 specification and change every 15,000 km or 12 months to maintain engine cleanliness and longevity. Use of low-ash or high-detergent oils helps protect the valve train and catalytic converter.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
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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)
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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