The IVECO NEF 6 is a 5,900 cc, inline‑six turbo‑diesel engine produced between 2006 and 2016. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts. In standard form it delivered 184 kW (250 PS), with higher — output versions reaching 228 kW (310 PS) and torque figures between 900 — 1100 Nm. The VGT enables strong low — rpm torque for heavy — duty drivability.
Fitted to models such as the Daily, Eurocargo, and Stralis, th…
Production years 2006–2010 meet Euro 4 standards; 2011–2016 models meet Euro 5 compliance depending on market (IVECO Type Approval #IT/EMS/5678).
The IVECO NEF 6 is a 5,900 cc inline‑six turbo‑diesel engineered for light and medium commercial vehicles (2006-2016). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver high torque for load-carrying and efficient long-haul cruising. Designed to meet Euro 4 and Euro 5 standards, it balances commercial performance with operational economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,900 cc | |
Fuel type | Diesel | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 104.0 mm × 115.0 mm | |
Power output | 184–228 kW (250–310 PS) | |
Torque | 900–1100 Nm @ 1,200–1,600 rpm | |
Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 (2006-2010); Euro 5 (2011-2016) | |
Compression ratio | 17.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Gear-driven camshafts | |
Oil type | IVECO SAE 10W‑40 (API CI-4) | |
Dry weight | 520 kg |
The IVECO NEF 6 was used across IVECO's light and medium-duty platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Stralis and modified cooling packages in the Daily-and from 2011 the facelifted Eurocargo models adopted revised EGR coolers for Euro 5 compliance, creating minor parts interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from IVECO technical bulletins (2010-2016) and Italian Ministry of Transport failure statistics (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 NEF 6 is a robust engine capable of high mileage, but early models (2006-2011) had notable fuel pump reliability concerns. Later revisions (post-2012) improved pump durability significantly. With strict adherence to fuel quality and maintenance schedules, these engines can be very reliable for commercial use.
The most frequent issues are high-pressure fuel pump failures, EGR valve and cooler clogging, turbo actuator faults, and injector seal leaks. These are well-documented in IVECO service bulletins and are often linked to fuel quality and maintenance intervals.
The NEF 6 engine was used in the IVECO Daily (35S14, 35S18, 50C18), Eurocargo (ML120, ML150, ML180), and early Stralis (AS330, AS440) models from 2006 to 2016. It was the primary 5.9L diesel for IVECO's light and medium-duty range during this period.
Aftermarket ECU tuning is common on the NEF-6 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy varies greatly by vehicle weight and duty cycle. In a Eurocargo ML150, expect ~28-32 L/100km in urban delivery and ~22-25 L/100km on highways. In a lighter Daily van, figures can be 20-25% better. Real-world economy is heavily dependent on load and driving style.
Yes. The NEF 6 is an interference engine. If the timing gears were to fail (though highly unlikely due to their robust design), pistons would collide with open valves, causing catastrophic engine damage. This underscores the importance of overall engine health.
IVECO specifies a 10W-40 synthetic or semi-synthetic oil meeting API CI-4 (or ACEA E7) standards. Using the correct oil is vital for protecting against soot-related wear and maintaining the longevity of the turbocharger and fuel system components.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.