The Vauxhall C30SE is a 2,969 cc, inline‑six naturally aspirated petrol engine produced between 1987 and 1993. It features multi — point fuel injection, a single overhead camshaft (SOHC), and two valves per cylinder. In standard form it delivers 110 kW (150 PS) and 235 Nm of torque, providing smooth linear power delivery for executive applications.
Fitted to models such as the Omega A and Senator B—including the 3.0i variants—the C30SE was engineered for refined cruising…
Production years 1987–1993 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/1025).
The Vauxhall C30SE is a 2,969 cc inline‑six naturally aspirated petrol engine engineered for executive sedans and coupes (1987–1993). It combines multi-point fuel injection with SOHC architecture to deliver smooth, linear power delivery and mechanical refinement. Designed to meet Euro 1 standards, it prioritizes drivability and serviceability over peak efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,969 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 87.5 mm | |
Power output | 110 kW (150 PS) | |
Torque | 235 Nm @ 3,200 rpm | |
Fuel system | Bosch Motronic MPFI (multi-point injection) | |
Emissions standard | Euro 1 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted) | |
Oil type | Vauxhall 10W‑40 mineral or semi-synthetic | |
Dry weight | 165 kg |
The Vauxhall C30SE was used across Vauxhall's Omega A and Senator B platforms with longitudinal mounting and derived from the GM CIH (Cam In Head) engine family. This engine received platform-specific adaptations—revised engine mounts in the Senator and modified exhaust manifolds in the Omega—and from 1990 the updated timing chain tensioner design improved reliability, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The C30SE's primary reliability risk is timing chain tensioner wear and distributor moisture ingress in early builds, with elevated incidence in high-mileage or poorly maintained examples. Vauxhall internal data from 1992 indicated a notable share of pre-1990 engines requiring timing system replacement before 140,000 km, while UK MOT records show catalytic converter failures in vehicles with chronic misfires. Infrequent servicing and incorrect oil accelerate wear, making interval adherence critical.
Analysis derived from Vauxhall technical bulletins (1988–1993) and UK MOT failure statistics (1998–2010). Repair procedures should follow manufacturer guidelines.
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The C30SE offers smooth, refined performance and mechanical simplicity, but early models (1987–1989) are prone to timing chain tensioner wear. With strict adherence to 10,000 km oil changes and ignition maintenance, examples can be dependable beyond 250,000 km.
Top issues include timing chain tensioner wear, distributor moisture ingress, throttle body carbon buildup, and exhaust manifold stud corrosion. These are documented in Vauxhall service bulletins and UK MOT data, especially in high-mileage or poorly maintained vehicles.
The C30SE powered the Omega A (3.0i) and Senator B (3.0i) from 1987–1993. It was also used in Opel Omega A and derived from GM’s CIH (Cam In Head) inline-six family. All are Euro 1 compliant with distributor-based ignition.
Limited. Basic modifications (performance air filter, exhaust, chip tuning) may yield +10–15 kW, but the SOHC 12-valve head and low compression limit gains. Aggressive tuning is not recommended due to marginal bottom-end strength and distributor ignition constraints.
In an Omega A 3.0i, expect ~10.2 L/100km combined (28 mpg UK). City driving yields ~13.0 L/100km, highway ~7.8 L/100km. Real-world economy depends on driving style and ignition system condition—misfires significantly increase consumption.
No. The C30SE is a non-interference engine. If the timing chain fails, piston-to-valve contact will not occur, though the engine will stop running. Chain replacement is still recommended at signs of wear to avoid collateral damage.
Vauxhall specifies 10W-40 mineral or semi-synthetic oil meeting ACEA A2/B2 standards. Full synthetic is acceptable but not required. Never use low-viscosity oils (e.g., 5W-30), as they may reduce chain tensioner damping.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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