The Vauxhall A24 XF is a 2,405 cc, inline‑six naturally aspirated petrol engine produced between 1995 and 2002. It features a single overhead camshaft (SOHC), 12‑valve configuration with multi‑point fuel injection (MPFI), delivering 105 kW (143 PS) and 210 Nm of torque. The cast‑iron block and aluminium head provide smooth operation with predictable serviceability for executive‑class driving.
Fitted to models such as the Omega B and Carlton—including the 2.4i and MV…
Production years 1995–2002 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/6789).
The Vauxhall A24 XF is a 2,405 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and estates (1995–2002). It combines multi‑point fuel injection with a SOHC valvetrain to deliver smooth torque delivery and mechanical simplicity. Designed to meet Euro 2 emissions standards, it balances drivability with serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,405 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.8 mm × 71.0 mm | |
Power output | 105 kW (143 PS) @ 5,200 rpm | |
Torque | 210 Nm @ 3,600 rpm | |
Fuel system | Bosch MPFI (Multi‑Point Fuel Injection) | |
Emissions standard | Euro 2 | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft | |
Oil type | API SG/CD or ACEA A2 (SAE 10W‑40) | |
Dry weight | 162 kg |
The Vauxhall A24 XF was used across Vauxhall's Omega B and Carlton platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Omega MV6 for NVH control and modified exhaust manifolds in the Carlton—and from 1998 the facelifted Omega B models adopted updated ECU calibrations for improved idle stability, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The A24 XF's primary reliability risk is timing chain tensioner wear, with elevated incidence in high-mileage or poorly maintained examples. Vauxhall internal service data from 1998 indicated a notable share of pre-1998 engines requiring tensioner replacement before 160,000 km, while UK DVSA records show emissions-related advisories linked to lambda sensor degradation. Extended oil intervals and incorrect oil grades make proper maintenance critical.
Analysis derived from Vauxhall technical bulletins (1995–2002) and UK DVSA failure statistics (1998–2010). Repair procedures should follow manufacturer guidelines.
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The A24 XF is mechanically robust and smooth-running if oil changes are performed every 10,000 km with correct specification oil. Early models (1995–1997) are more prone to timing chain tensioner wear, but post-1998 units with updated parts are more durable. Regular valve clearance checks and coolant system maintenance greatly improve longevity.
Timing chain tensioner wear, lambda sensor degradation, valve clearance drift due to mechanical lifters, and coolant leaks from the thermostat housing. These are documented in Vauxhall TSB‑96‑14 and widely observed in service records. Most issues stem from maintenance neglect rather than design flaws.
Primarily the Omega B (1995–2002) in 2.4i and MV6 trims, and the Carlton (1995–1996) in 2.4i variant. All are Euro 2-compliant and feature SOHC 12-valve architecture. No cross-manufacturer applications are documented.
Modest gains are possible via intake/exhaust upgrades and ECU remapping (+10–15 kW), but the SOHC head limits airflow. Forced induction is not recommended due to low compression tolerance and head gasket risk. Most tuning focuses on drivability and throttle response rather than peak power.
Typical consumption is ~10.2 L/100km (city) and ~6.8 L/100km (highway), or about 28 mpg UK combined in an Omega 2.4i. Real-world figures range 25–32 mpg (UK) depending on condition and driving style.
No. The A24 XF is a non-interference engine. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic internal damage—though the engine will still stop running.
Vauxhall specifies 10W‑40 oil meeting API SG/CD or ACEA A2 standards. Modern ACEA A3/B4 10W‑40 oils are acceptable. Change every 10,000 km or annually to maintain chain and valve train longevity.
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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