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 drivers seeking a balance of relaxed highway performance and everyday drivability. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a three‑way catalytic converter, allowing Euro 5 compliance across all production years.
One documented concern is timing chain tensioner wear in high-mileage applications, which can lead to chain slack and misalignment. This issue is referenced in Vauxhall Service Bulletin 13‑027, which notes increased wear in tensioners subjected to extended oil change intervals. From 2014, revised tensioner materials and guide rails were introduced to improve durability in later Insignia builds.
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 naturally aspirated design provides predictable throttle response ideal for mixed driving but requires consistent oil changes every 15,000 km to protect the front-mounted timing chain. GM Dexos2 (5W-30) oil is essential due to its low SAPS formulation, which reduces EGR and catalyst fouling. Extended service intervals accelerate tensioner wear—per Vauxhall SIB 13 027—and may cause cam/crank correlation faults. Bosch ME17.4 ECUs benefit from periodic throttle body cleaning. EGR systems should be inspected for coking, which can trigger limp mode in high-mileage units.
Oil Specs: Requires GM Dexos2 (5W-30) specification (Vauxhall SIB 12 015). Meets ACEA C3 but includes OEM-specific shear stability.
Emissions: Euro 5 certification applies to all 2011–2018 Z24LER models (VCA Type Approval #VCA/EMS/5210). No Euro 6 variants were produced.
Power Ratings: Measured under SAE J1349 standards. Power output assumes RON 95 petrol (Vauxhall TIS Doc. VP2425).
Vauxhall Technical Information System (TIS): Docs VP2412, VP2418, SIB 13 027
VCA Type Approval Database (VCA/EMS/5210)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front timing cover near the oil filter housing (Vauxhall TIS VP2412). The 8th VIN digit indicates engine family ('Z' for Z24 series). All Z24LER units feature a black plastic valve cover with '2.4' branding. Critical differentiation from turbocharged LWR: Z24LER has no turbocharger or intercooler piping and uses Bosch ME17.4 ECU. Bosch ECU is mounted on the firewall. Service parts for timing system require production date verification—units before 06/2014 use early-design tensioners per Vauxhall SIB 13 027.
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.
Find answers to most commonly asked questions about VAUXHALL Z24LER.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
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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
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VCA Certification Portal
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