The Dacia H4M 738 is a 1,598 cc, inline — four, naturally aspirated petrol engine produced between 2008 and 2018. It is part of the Renault — Nissan M4M/H4M family, designed for durability and low — cost ownership. Featuring a cast — iron block, aluminium head, and multi — point fuel injection (MPi), it delivers 85 kW (115 PS) and 152 Nm of torque. Its SOHC 8 — valve design prioritises simplicity and serviceability.
Fitted to models such as the Dacia Logan, Sandero, and Duster, th…
Production years 2008–2009 meet Euro 4 standards; 2010–2018 models comply with Euro 5 .
The Dacia H4M 738 is a 1,598 cc inline-four petrol engine engineered for budget-oriented compact models (2008–2018). It combines multi-point fuel injection with a cast-iron block for durability, delivering reliable urban and highway performance. Designed to meet Euro 5 standards, it balances cost-effective operation with proven mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol (Unleaded, 95 RON) | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.0 mm × 83.6 mm | |
Power output | 85 kW (115 PS) @ 5,500 rpm | |
Torque | 152 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (MPi) | |
Emissions standard | Euro 4 (2008–2009); Euro 5 (2010–2018) | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (renew every 120,000 km) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 117 kg |
The Dacia H4M 738 was used across Dacia's Logan, Sandero, and Duster platforms with transverse mounting and shared with Renault and Nissan in emerging markets. This engine received platform-specific adaptations-shorter intake manifolds in the Sandero and revised engine mounts in the Duster-and from 2014 the facelifted Logan II adopted revised piston rings to reduce oil consumption, creating service part differences. All adaptations are documented in OEM technical bulletins.
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The H4M 738's primary reliability risk is intake valve carbon buildup in urban use, with elevated incidence in vehicles driven under 15 km per trip. Renault field reports from 2016 indicated over 30% of high-mileage units showed restricted airflow, while VCA MOT data links hesitation and misfires to uncleaned intake systems. Short-trip driving and low-octane fuel increase deposit formation, making periodic cleaning and use of quality petrol critical.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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Yes, the H4M 738 is fundamentally reliable with proper maintenance. Its simple SOHC design and robust cast-iron block contribute to longevity. Key concerns are timing belt neglect and intake carbon buildup. Pre-2014 engines may consume more oil, but post-2014 revisions improved this. Using quality oil and petrol, and adhering to service intervals, ensures trouble-free operation beyond 200,000 km.
The most common issues are intake valve carbon buildup causing rough idle, timing belt failure if not replaced on schedule, and oil consumption in pre-2014 engines. Coolant leaks from the thermostat housing and failing ignition coils are also reported. These are documented in Renault service bulletins and field reports, with clear OEM repair procedures available.
The H4M 738 1.6L 115 PS engine was used in the Dacia Logan (2008–2018), Sandero (2008–2018), and Duster (2010–2018). It was also fitted to the Renault Symbol and Nissan NP200 in select markets. All applications meet Euro 5 from 2010 onward, with VIN 8th digit 'K' identifying this engine variant.
Limited tuning potential exists. ECU remaps offer modest gains (~5–10 kW) but provide little benefit due to the engine's naturally aspirated nature. Performance upgrades like intake, exhaust, or camshafts are rare and offer minimal returns. The engine is designed for economy and reliability, not high output, so significant tuning is not cost-effective or widely supported.
In combined driving, expect 6.5–7.5 L/100km (37–43 mpg UK). The Logan and Sandero typically achieve lower consumption in highway use (~5.8 L/100km), while the heavier Duster may use 7.8 L/100km in city driving. Real-world economy depends on driving style, but the engine is efficient for its class and aspiration type.
Yes, the H4M 738 is an interference engine. If the timing belt fails, the pistons can strike the open valves, resulting in severe internal damage. This makes strict adherence to the 120,000 km replacement interval essential. Any signs of belt wear or noise should prompt immediate inspection.
Use SAE 5W-30 or 10W-40 engine oil meeting ACEA A1/B1 or A5/B5 specifications. Fully synthetic oil is recommended for extended intervals and better protection. Change oil every 15,000 km or annually. Proper oil selection helps reduce wear and supports longevity, especially in hot climates.
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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