The Vauxhall Z24LER is a 2,384 cc, inline‑four naturally aspirated petrol engine produced between 2011 and 2018. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 125 kW (170 PS) and 230 Nm of torque, engineered for smooth mid — range response and refined cruising.
Fitted to models such as the Insignia A, Astra J, and Zafira Tourer—including the 2.4i variants—the Z24LER was designed for driver…
All production years 2011–2018 meet Euro 5 standards .
The Vauxhall Z24LER is a 2,384 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and MPVs (2011–2018). It combines sequential multi‑point fuel injection with DOHC architecture to deliver linear power delivery and stable motorway performance. Designed to meet Euro 5 emissions standards, it balances refinement with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,384 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 98.0 mm | |
Power output | 125 kW (170 PS) | |
Torque | 230 Nm @ 4,400 rpm | |
Fuel system | Sequential multi‑point injection (Bosch ME17.4) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 136 kg |
The Vauxhall Z24LER was used across Vauxhall's Epsilon II and Delta II platforms with transverse mounting and shared with Opel under GM's global engine strategy. This engine received platform-specific adaptations—reinforced mounts in the Insignia and modified cooling in the Zafira Tourer—and from 2014 the facelifted Insignia A models adopted updated timing components, creating minor software and hardware interchange limits. 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 Z24LER offers smooth performance and good highway refinement, but pre-2014 models are prone to timing chain tensioner wear. Later builds saw component updates. With strict adherence to 15,000 km oil changes using GM Dexos2, well-maintained examples can exceed 200,000 km reliably.
Top issues include timing chain tensioner wear, throttle body fouling, EGR valve sticking, and oil leaks from aged gaskets. These are documented in Vauxhall service bulletins 13‑027 and 12‑015, and frequently appear in UK MOT failure records for Insignia and Zafira Tourer models.
The Z24LER powered the Insignia A (2011–2017), Astra J GTC (2012–2015), and Zafira Tourer (2011–2018) as the 2.4i. It was also used by Opel in identical models under GM’s shared-engine program.
Aftermarket ECU tuning is common on the Z24LER 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.
Moderate for its class. In an Insignia 2.4i, expect ~9.6 L/100km (city) and ~6.2 L/100km (highway), or about 34 mpg UK combined. Real-world mixed driving typically returns 30–38 mpg (UK), depending on condition and driving style.
Yes. The Z24LER is an interference engine. If the timing chain jumps or breaks, piston-to-valve contact can cause internal damage. Prompt attention to chain noise or correlation faults is essential to prevent engine failure.
Vauxhall specifies GM Dexos2 5W‑30 synthetic oil. This low-SAPS formulation helps reduce carbon buildup in the PCV and EGR systems. Oil changes every 15,000 km (or annually) are recommended, especially in stop-start or short-trip driving.
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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