The Vauxhall Z24XE is a 2,405 cc, V6 naturally aspirated petrol engine produced between 2003 and 2008. It features a dual overhead camshaft (DOHC) layout with 24 valves and sequential multi — point fuel injection. In standard form it delivered 125 kW (170 PS) and 230 Nm of torque, providing smooth linear power and refined cruising for mid — size applications.
Fitted to models such as the Vectra C and Signum, the Z24XE was engineered for drivers seeking balanced performance, a…
All production years 2003–2008 meet Euro 4 standards .
The Vauxhall Z24XE is a 2,405 cc V6 naturally aspirated petrol engine engineered for mid-size executive models (2003–2008). It combines DOHC architecture with sequential multi-point injection to deliver smooth, linear power and relaxed highway cruising. Designed to meet Euro 4 emissions standards, it balances performance with drivability and moderate fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,405 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 74.8 mm | |
Power output | 125 kW (170 PS) @ 5,600 rpm | |
Torque | 230 Nm @ 3,200 rpm | |
Fuel system | Sequential multi-point injection (Bosch Motronic ME7.6) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 168 kg |
The Vauxhall Z24XE was used across Vauxhall's Vectra C and Signum platforms with longitudinal mounting and shared with Opel under GM's global architecture. This engine received platform-specific adaptations—reinforced subframes in the Signum and revised engine mounts in the Vectra C Estate—and from 2006 the facelifted models adopted updated CCV components, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
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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 manufacturer technical service bulletins and industry workshop records. 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 Z24XE offers smooth V6 performance but is prone to sludge-related issues if not maintained properly. Early models (2003–2005) are more susceptible to CCV clogging. With regular oil changes using Dexos2 5W-30 and updated breather components, it can be dependable beyond 200,000 km.
Top issues include CCV system sludge causing oil leaks, ignition coil pack failures, plastic thermostat housing cracks, and timing chain tensioner wear. These are documented in Vauxhall service bulletins, especially TIS 08-04-03 for sludge and TIS VEC‑IGN‑02 for coils.
It powered the Vectra C 2.4i (2003–2008) and Signum 2.4i (2003–2008). It was also used in Opel Vectra C and Signum under GM's global platform strategy. All are Euro 4 compliant.
Yes, but gains are modest due to naturally aspirated design. ECU remaps yield +8–12 kW, while exhaust and intake upgrades add marginal gains. Forced induction is complex and not common. Most owners prioritize reliability over tuning.
In a Vectra C 2.4i, expect ~11.2 L/100km (city) and ~6.9 L/100km (highway), or about 25 mpg UK combined. Real-world mixed driving typically yields 22–28 mpg (UK), depending on condition and driving style.
Yes. The Z24XE is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the chain is robust and rarely fails if oil is maintained.
Vauxhall specifies GM Dexos2 5W-30 or ACEA A3/B4 equivalent. This high-quality synthetic oil resists sludge and ensures proper lubrication of the chain. Change every 10,000–15,000 km max.
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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