The Vauxhall C30SEJ is a 2,969 cc, inline‑six naturally aspirated petrol engine produced between 1995 and 2003. It features a single overhead camshaft (SOHC), two valves per cylinder, and multi — point fuel injection. In standard form it delivered 130 kW (177 PS) with 265 Nm of torque, engineered for smooth, refined performance in executive sedans and coupés.
Fitted to models such as the Omega B and Senator B, the C30SEJ was designed for drivers prioritising linear power de…
All production years (1995–2003) comply with Euro 2 standards across EU and UK markets (VCA UK Type Approval #VCA/EMS/3345).
The Vauxhall C30SEJ is a 2,969 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and performance coupés (1995–2003). It combines multi-point fuel injection with a simple SOHC valvetrain to deliver smooth power delivery and dependable operation. Designed to meet Euro 2 emissions standards, it prioritises mechanical robustness and serviceability over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,969 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 85.0 mm | |
Power output | 130 kW (177 PS) | |
Torque | 265 Nm @ 3,200 rpm | |
Fuel system | Multi-point fuel injection (Bosch Motronic M1.5) | |
Emissions standard | Euro 2 | |
Compression ratio | 9.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt (front‑mounted) | |
Oil type | API SG/CD or ACEA A2 (SAE 10W‑40) | |
Dry weight | 165 kg |
The Vauxhall C30SEJ was used across Vauxhall's Omega B platform with longitudinal mounting. This engine received platform-specific adaptations—reinforced engine mounts in the Lotus Carlton-derived models and modified intake ducting for right-hand drive variants—and from 2000 the updated distributor drive gear created interchange limits for ignition components. All adaptations are documented in OEM technical bulletins.
The C30SEJ's primary reliability risk is distributor drive gear wear in early production units, with elevated incidence in high-mileage vehicles. Vauxhall internal data from 2001 indicated a measurable increase in ignition-related service visits before 130,000 km for 1995–1999 builds, while UK DVLA records show timing belt neglect as a common cause of engine seizure in later life. Extended oil intervals and low-quality petrol accelerate valve train wear, making maintenance adherence critical.
Analysis derived from Vauxhall technical bulletins (1998–2002) and UK DVLA/DVSA service records (1999–2008). 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 C30SEJ is mechanically robust and exceptionally smooth, with good long-term reliability if maintained properly. Early models (1995–1999) have a known issue with distributor gear wear, resolved from 2000 onward. Critical maintenance includes 60,000 km timing belt changes and periodic valve clearance checks. With correct care, these engines often exceed 250,000 km.
Top issues include distributor drive gear wear (pre-2000), timing belt neglect leading to engine seizure, valve clearance drift due to infrequent adjustment, and throttle body carbon buildup. These are documented in Vauxhall TSB-98-04-21 and service manuals. Regular maintenance mitigates most concerns.
The 3.0i (C30SEJ) was used in the Omega B (1995–2003) and Senator B (1995–1999). Both are longitudinal-mounted applications meeting Euro 2 emissions standards. It was Vauxhall’s flagship inline-six for executive models during this era.
Limited potential. The C30SEJ’s SOHC head and low compression restrict gains. Mild improvements (+10–15 PS) are possible with performance exhaust, cold air intake, and ECU remap, but significant tuning is impractical. Most owners prioritise refinement over performance.
Moderate for its displacement. In an Omega 3.0i, expect ~11.5 L/100km (city) and ~7.2 L/100km (highway), or about 25 mpg UK combined. Real-world mixed driving typically returns 22–28 mpg (UK) when maintained properly.
Yes. The C30SEJ is an interference engine. If the timing belt fails or jumps, piston-to-valve contact will cause severe internal damage. This is why the 60,000 km belt replacement interval is critical—never exceed it.
Vauxhall originally specified API SG/CD or ACEA A2 10W-40 mineral or semi-synthetic oil. Modern ACEA A3/B4 10W-40 or 5W-40 oils are acceptable and offer better protection. Change every 10,000 km or 12 months to maintain valve train and timing component life.
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.