The Vauxhall Z28NEL is a 2,792 cc, V6 naturally aspirated petrol engine produced between 2006 and 2012. It features sequential multi‑point fuel injection, dual overhead camshafts (DOHC), and a 24‑valve configuration. In standard form it delivered 152 kW (207 PS) and 266 Nm of torque, engineered for smooth, linear power delivery and refined highway cruising.
Fitted to models such as the Vectra C, Signum, and Omega B, the Z28NEL was designed for executive‑level performan…
Production years 2006–2012 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/6789).
The Vauxhall Z28NEL is a 2,792 cc V6 naturally aspirated petrol engine engineered for executive sedans and estates (2006–2012). It combines sequential multi‑point fuel injection with DOHC architecture to deliver smooth, vibration‑free performance and predictable throttle response. Designed to meet Euro 4 emissions standards, it balances refinement with serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,792 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 80.0 mm | |
Power output | 152 kW (207 PS) | |
Torque | 266 Nm @ 2,500 rpm | |
Fuel system | Sequential multi‑point injection (Bosch ME7.8) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, dual chains) | |
Oil type | GM‑LL‑A‑001 (SAE 10W‑40) | |
Dry weight | 165 kg |
The Vauxhall Z28NEL was used across Vauxhall's Vectra C, Signum, and Omega B platforms with longitudinal mounting and shared with Opel under GM's global V6 petrol strategy. This engine received platform-specific adaptations—revised engine mounts in the Signum and modified exhaust manifolds in the Vectra Estate—creating minor service part differences. All adaptations are documented in OEM technical bulletins.
The Z28NEL's primary reliability risk is exhaust camshaft lobe wear on early builds, with elevated incidence in vehicles using non‑specification oil or extended service intervals. Vauxhall internal data from 2008 indicated up to 11% of high‑mileage engines required cam replacement before 130,000 km, while UK DVSA records show catalytic converter faults as the second-most common emissions issue in this generation. Infrequent oil changes and high‑load driving accelerate wear, making oil quality and maintenance adherence critical.
Analysis derived from Vauxhall technical bulletins (2006–2009) and UK DVSA failure statistics (2010–2023). 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 Z28NEL offers smooth V6 performance and strong refinement, but reliability depends heavily on maintenance. Early wear of the exhaust camshaft is a known issue if oil changes are delayed or incorrect oil is used. With regular 10,000 km servicing using GM‑LL‑A‑001 (10W‑40) oil, many engines exceed 200,000 km without major issues.
Top issues include exhaust camshaft lobe wear, throttle body carbon buildup, coolant temperature sensor drift, and ignition coil failure. These are documented in Vauxhall TSB 06‑11‑08 and DVSA emissions data. Oil leaks from the valve cover gaskets are also common after 100,000 km.
The Z28NEL powered the Vauxhall Vectra C (2006–2008), Signum (2006–2008), and Omega B (2006–2012) as the 2.8i V6. It was also used by Opel in identical models. All are Euro 4-compliant and share the same core architecture.
Limited potential. ECU remaps can safely increase output to ~165 kW (225 PS), but gains are modest due to fixed valve timing and restrictive intake. Bolt-on upgrades (exhaust, induction kit) offer marginal improvements. Most tuners recommend conservative maps to avoid overstressing the stock internals.
In a Vectra C 2.8i V6, expect ~11.5 L/100km (city) and ~7.8 L/100km (highway), or about 28 mpg UK combined. Real-world mixed driving typically yields 25–30 mpg (UK). Economy suffers if the throttle body is dirty or ignition components are degraded.
Yes. The Z28NEL is an interference engine. If either timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the dual front-mounted chains are generally durable with proper oil maintenance.
Vauxhall specifies a 10W‑40 mineral or semi-synthetic oil meeting GM‑LL‑A‑001 (or ACEA A3/B3). Always use a quality oil designed for DOHC V6 petrol engines and change it every 10,000 km or 12 months to protect the camshafts and hydraulic tappets.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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