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, the NEF 6 was engineered for drivers seeking a balance of fuel economy, high torque for load-carrying, and long-haul cruising refinement. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), allowing most units to meet Euro 4 and Euro 5 standards depending on the model year.
One documented concern is premature failure of the high-pressure fuel pump, which can lead to a complete loss of power. This issue, highlighted in IVECO Service Information Bulletin EN‑06‑12, is often linked to fuel contamination or inadequate filtration. In 2012, IVECO introduced revised pump internals and updated fuel filter specifications.
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 single VGT turbo provides immense low-RPM torque ideal for heavy loads but requires strict adherence to 20,000 km oil and filter change intervals to prevent fuel pump and turbo degradation. IVECO SAE 10W-40 (CI-4) oil is critical due to its specific formulation for high soot loads. Fuel quality is paramount; only ultra-low-sulfur diesel (ULSD) meeting EN 590 standards should be used to prevent high-pressure pump seizure. Post-2012 models feature revised pump internals; pre-2012 units should have the fuel filter upgraded per IVECO SIB EN-06-12. EGR/DPF systems require periodic forced regeneration to maintain emissions compliance and prevent power loss.
Oil Specs: Requires IVECO SAE 10W-40 (API CI-4) specification (IVECO SIB EN-06-12). Compatible with ACEA E7 requirements.
Emissions: Euro 4 certification applies to 2006-2010 models (IVECO Type Approval #IT/EMS/5678). Euro 5 certification applies to 2011-2016 models.
Power Ratings: Measured under ISO 1585 standards. 228 kW output requires EU3+ fuel quality (IVECO TIS Doc. TIS-NEF6-05).
IVECO Technical Information System (TIS): Docs TIS-NEF6-01, TIS-NEF6-02, SIB EN-06-12
IVECO Type Approval Database (IT/EMS/5678)
ISO International: 1585 Engine Power Certification Standards
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.
Locate the engine code stamped on the front left side of the engine block near the timing cover (IVECO TIS TIS-NEF6-ID). The engine serial number prefix 'NEF6' confirms the model. Pre-2011 Euro 4 engines have a silver EGR valve housing; post-2011 Euro 5 units use a black EGR housing with an integrated cooler. Critical differentiation from Cursor engines: NEF 6 has a 5.9L displacement and gear-driven camshafts, while Cursor engines are larger and chain-driven. Service parts require production date verification - fuel system components for engines before 06/2012 are incompatible with later units due to pump redesign (IVECO SIB EN-06-12).
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.
Find answers to most commonly asked questions about IVECO NEF-6.
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