The Vauxhall U 25 TD is a 2,498 cc, inline‑four turbo‑diesel engine produced between 1993 and 1998. It features indirect fuel injection via a Bosch VE rotary pump, a KKK K26 turbocharger, and a single overhead camshaft (SOHC) with two valves per cylinder. In standard form it delivered 82 kW (112 PS) and 230 Nm of torque, prioritising durability and low‑end pulling power over refinement.
Fitted primarily to the Omega A and Senator B, the U 25 TD was engineered for fleet and execu…
All production years 1993–1998 meet Euro 1 emissions standards .
The Vauxhall U 25 TD is a 2,498 cc inline‑four turbo‑diesel engineered for executive sedans and estate cars (1993–1998). It combines indirect injection with a KKK K26 turbocharger to deliver strong low‑rpm torque and mechanical robustness. Designed to meet Euro 1 emissions standards, it prioritises serviceability and longevity over refinement or fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,498 cc | |
Fuel type | Diesel (EN 590) | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 93.0 mm × 92.0 mm | |
Power output | 82 kW (112 PS) @ 4,200 rpm | |
Torque | 230 Nm @ 2,200 rpm | |
Fuel system | Bosch VE rotary injection pump (mechanical) | |
Emissions standard | Euro 1 | |
Compression ratio | 22.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | KKK K26 (non‑wastegated) | |
Timing system | Belt (front‑mounted, 60,000 km replacement) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 215 kg |
The Vauxhall U 25 TD was used across Vauxhall's Omega A platform with longitudinal mounting and shared with Opel across European markets. This engine received minor platform-specific adaptations—revised engine mounts in the Senator B and updated cooling ducting in late‑production Omega A—and from 1996 the revised turbo housing per TSB 06‑012, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
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 U 25 TD is mechanically robust and can exceed 300,000 km with disciplined maintenance. Key risks are turbo oil seal failure (pre-1996) and timing belt neglect. Regular oil changes, timely belt replacement, and clean fuel are essential for longevity.
The main issues are turbo oil seal leaks, timing belt failure (if overdue), Bosch VE pump calibration drift from water in fuel, and glow plug relay faults. All are documented in Vauxhall service bulletins and repair manuals.
The U 25 TD powered the Omega A (1993–1998) and Senator B (1993–1994) in 2.5 TD form. It is identical to the Opel Omega A 2.5 TD and was not used in smaller Vauxhall models like the Cavalier or Vectra.
Yes—adjusting the Bosch VE pump’s fuel screw or installing a boost controller can yield +15–20 kW. However, the stock turbo and head gasket have limited headroom. Aggressive tuning without supporting upgrades risks head gasket failure or turbo damage.
Official combined is ~7.5 L/100km (38 mpg UK). Real-world mixed driving typically achieves 8.0–9.0 L/100km (31–35 mpg UK), depending on condition, driving style, and turbo health.
Yes. The U 25 TD is an interference design. Timing belt failure will cause piston-to-valve contact, resulting in severe engine damage. Replacement at 60,000 km is mandatory.
Vauxhall specifies ACEA B2/B3 (10W‑40) mineral or semi-synthetic diesel oil. Modern low-SAPS or C3 oils are not suitable for this indirect-injection engine.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.