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.
The NEF 6's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel. IVECO internal service data from 2014 indicated a significant portion of pre-2012 engines required pump replacement before 200,000 km, while fleet operator reports link a notable share of roadside breakdowns to fuel system faults. Extended service intervals and contaminated fuel make strict adherence to fuel quality and filter changes critical.
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.
Yes, the NEF 6 has tuning potential. ECU remaps can safely increase power by 20-30 kW and torque by 100-150 Nm on stock internals. However, aggressive tuning increases stress on the fuel system and turbo, so supporting modifications and enhanced maintenance are strongly recommended.
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
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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