The Vauxhall 25TD is a 2,498 cc, inline‑four turbocharged diesel engine produced between 1988 and 1995. It features an indirect injection (IDI) design with a pre — chamber combustion system, a cast‑iron block and head, and a mechanically governed Bosch injection pump with exhaust gas recirculation (EGR). In standard tune it delivered 65 kW (88 PS) at 4,200 rpm and 190 Nm of torque at 2,400 rpm, providing robust, fuel — efficient performance suited to executive sedans and li…
Production years 1988–1995 meet Euro 1 standards .
The Vauxhall 25TD Diesel is a 2,498 cc inline‑four turbocharged indirect injection engine engineered for executive sedans and light commercial vehicles (1988–1995). It combines a mechanically controlled Bosch injection pump with a robust cast‑iron architecture and a single turbocharger to deliver strong low‑rpm torque and improved refinement over naturally aspirated predecessors. Designed to meet Euro 1 emissions standards, it balances durability with moderate performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,498 cc | |
Fuel type | Diesel (EN 590) | |
Configuration | Inline‑4, OHV, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 95.0 mm × 88.0 mm | |
Power output | 65 kW (88 PS) @ 4,200 rpm | |
Torque | 190 Nm @ 2,400 rpm | |
Fuel system | Bosch VE mechanical injection pump with indirect injection (pre-chamber) | |
Emissions standard | Euro 1 | |
Compression ratio | 22.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single KKK K14 turbocharger (non-VGT) | |
Timing system | Gear‑driven camshaft (front‑mounted) | |
Oil type | SAE 15W‑40 mineral diesel oil (API CD) | |
Dry weight | 165 kg |
The Vauxhall 25TD Diesel was used across Vauxhall's Carlton Mk2, Senator B, and Omega A platforms with longitudinal front-engine mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Senator and modified intercooler ducting in the Omega—and from 1991 the introduction of a revised turbo oil feed system to address seal failures, creating interchange limits. 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 Vauxhall technical bulletins (1988–1995) and UK DVSA historical failure statistics (1990–2000). 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 25TD is durable with proper maintenance, but pre-1991 engines are prone to turbo oil seal failure. Post-1991 units with the revised turbo are significantly more robust. Regular oil changes with SAE 15W-40 diesel oil and clean fuel are essential for longevity in classic or executive vehicle use.
Top issues include turbo oil seal failure (pre-1991), Bosch VE pump wear from contaminated fuel, pre-chamber carbon buildup due to EGR, and rear-corner head gasket leaks. These are documented in Vauxhall service bulletins EB‑90‑04 and workshop manuals from the Omega/Carlton era.
The 25TD powered the Carlton Mk2 (1988–1994), Senator B (1988–1993), and Omega A (1989–1995). It was exclusive to Vauxhall and not shared with other GM brands in the UK market during this period.
Modest gains are possible via injection pump recalibration (+8–10 kW) and exhaust upgrades, but the indirect injection design and modest airflow limit potential. Turbo upgrades are not recommended due to head integrity and oiling constraints. Most owners retain stock tune for reliability.
Typical consumption is 7.8 L/100km (36 mpg UK) in mixed driving. Highway cruising yields ~6.5 L/100km (43 mpg UK), while city use may reach 9.2 L/100km (31 mpg UK). Real-world figures depend heavily on driving style, turbo condition, and engine maintenance.
No. The 25TD uses an OHV design with ample piston-to-valve clearance. Timing gear failure may cause valve float or bent pushrods, but catastrophic piston-valve contact is highly unlikely.
Vauxhall specifies SAE 15W-40 mineral diesel oil meeting API CD standards. Modern low-ash or synthetic oils are not recommended due to the engine’s reliance on traditional additive packages for cam and bearing protection.
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.