The Vauxhall X 25 DT is a 2,499 cc, inline‑four turbo‑diesel engine produced between 2003 and 2008. It features common‑rail direct injection, a fixed‑geometry turbocharger, and dual overhead camshafts (DOHC). In standard form it delivers 100 kW (136 PS) and 320 Nm of torque, offering strong low‑rpm pull ideal for midsize MPVs and estates.
Fitted to models such as the Vectra C, Signum, and Zafira B—including the 2.5 CDTi variants—the X 25 DT was engineered for torque-focused driving and towing capability. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a diesel oxidation catalyst (DOC), enabling Euro 4 compliance across all production years.
One documented concern is high-pressure fuel pump (HPFP) drive shaft wear linked to marginal fuel lubricity, highlighted in Vauxhall Service Bulletin PI0412. This is often exacerbated by repeated short trips and thermal stress during cold starts. From 2006, Vauxhall introduced revised HPFP shaft hardening and updated camshaft drive lobes to reduce premature wear.
All production years (2003–2008) meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/3215).
The Vauxhall X 25 DT is a 2,499 cc inline‑four turbo‑diesel engineered for midsize and MPV models (2003–2008). It combines common‑rail direct injection with a fixed‑geometry turbocharger to deliver strong low‑rpm torque and robust highway performance. Designed to meet Euro 4, it balances drivability with emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,499 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 93.0 mm × 92.0 mm | |
| Power output | 100 kW (136 PS) @ 4,000 rpm | |
| Torque | 320 Nm @ 2,000 rpm | |
| Fuel system | Bosch CP3 common‑rail (up to 1,600 bar) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 17.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed‑geometry turbo (Garrett GT2556) | |
| Timing system | Chain (front‑mounted; maintenance‑free design) | |
| Oil type | ACEA B4 10W‑40 or 5W‑30 | |
| Dry weight | 175 kg |
The fixed-geometry turbo provides strong low-RPM torque ideal for towing and motorway cruising but requires strict adherence to 15,000 km oil change intervals using ACEA B4 10W-40 or 5W-30 to protect the high-pressure fuel pump and timing chain. Ultra-low-sulfur diesel (EN 590) is mandatory; biodiesel blends above B5 are not recommended. Repeated short trips accelerate HPFP drive shaft wear due to inadequate lubrication—addressed in Vauxhall SIB PI0412. The front-mounted timing chain is considered lifetime but relies on clean oil; sludge from neglected changes may impair tensioner function. EGR systems should be inspected periodically to prevent carbon buildup and limp-mode events.
Oil Specs: Requires ACEA B4 specification (Vauxhall Owner's Manual 2004).
Emissions: Euro 4 certification applies to all 2003–2008 X 25 DT engines (VCA Type Approval #VCA/EMS/3215).
Power Ratings: Measured under SAE J1349 standards. Output assumes EN 590 diesel fuel (Vauxhall TIS Doc. TIS-X25DT-04).
Vauxhall Technical Information System (TIS): Docs TIS-X25DT-01 to TIS-X25DT-04, SIB PI0412
VCA Type Approval Database (VCA/EMS/3215)
SAE International: J1349 Engine Power Certification Standards
The Vauxhall X 25 DT was used across Vauxhall's Vectra C, Signum, and Zafira B platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Signum for NVH control and modified airbox routing in the Zafira B—and from 2006 the Vectra C adopted updated HPFP hardware, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crank pulley (Vauxhall TIS TIS-X25DT-06). The 7th VIN digit for X 25 DT applications is 'X'. All units feature black valve covers with integrated coil packs and a Garrett GT2556 turbo with fixed geometry. Critical differentiation from later 2.0 BiTurbo (M9R): X 25 DT uses a Bosch CP3 high-pressure pump driven off the camshaft and lacks balance shafts. Service parts for HPFP (pre- and post-2006) are not interchangeable due to shaft hardening changes per Vauxhall SIB PI0412.
The X 25 DT's primary reliability risk is high-pressure fuel pump (HPFP) drive shaft wear under repeated short-trip urban use. Vauxhall internal field data (2007) indicated elevated HPFP replacement rates before 90,000 km in urban fleets, while UK DVSA records show moderate EGR-related advisories in high-mileage examples. Thermal cycling and fuel lubricity make driving profile and oil quality critical.
Analysis derived from Vauxhall technical bulletins (2003–2008) and UK DVSA failure statistics (2008–2018). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL X-25-DT.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VAUXHALL or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVAUXHALL documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
