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 (VCA UK Type Approval #VCA/EMS/5210).
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 | GM Dexos2 (SAE 5W‑30) | |
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.
The Z24LER's primary reliability risk is timing chain tensioner wear, with elevated incidence in vehicles subjected to extended oil change intervals. Vauxhall internal data from 2015 indicated a significant share of pre-2014 builds required tensioner replacement before 130,000 km, while UK DVSA MOT records show timing-related faults in high-mileage Insignias. Infrequent oil changes accelerate wear, making maintenance adherence critical.
Analysis derived from Vauxhall technical bulletins (2013–2017) and UK DVSA 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 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.
Limited potential. ECU remaps typically yield +10–15 kW safely. Bolt-on upgrades (cold air intake, exhaust) offer modest gains. Most owners prioritize reliability over tuning due to the engine’s naturally aspirated design and age.
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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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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