The Vauxhall CIH 3.0L E S is a 2,994 cc, inline‑six petrol engine produced between 1975 and 1986. It features a single overhead camshaft (SOHC) 12‑valve layout with a carburettor or Bosch L — Jetronic fuel injection depending on variant. In standard fuel — injected form it delivered 103 kW (140 PS) at 5,200 rpm and 226 Nm of torque at 3,600 rpm, providing smooth, torque — rich performance for executive applications.
Fitted to models such as the Vauxhall Royale, Senator A, and ea…
Production years 1975–1982 meet pre-Euro standards; 1983–1986 models may comply with early Euro 1-equivalent requirements under VCA UK Type Approval #VCA/EMS/2345.
The Vauxhall CIH 3.0L E S is a 2,994 cc inline‑six petrol engine engineered for executive sedans and coupés (1975–1986). It combines SOHC 12‑valve architecture with Bosch L-Jetronic fuel injection (on E S variants) to deliver smooth, linear power and relaxed motorway cruising. Designed before formal Euro standards, later builds incorporated emissions controls to meet early UK regulatory requirements.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,994 cc | |
Fuel type | Petrol (Unleaded, post-1986 only) | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 95.0 mm × 105.0 mm | |
Power output | 103 kW (140 PS) @ 5,200 rpm | |
Torque | 226 Nm @ 3,600 rpm | |
Fuel system | Bosch L-Jetronic electronic fuel injection | |
Emissions standard | Pre-Euro (1975–1982); early Euro 1-equivalent (1983–1986) | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven SOHC | |
Oil type | Vauxhall SAE 10W‑40 mineral oil (API SF/CC) | |
Dry weight | 172 kg |
The Vauxhall CIH 3.0L E S was used across Vauxhall's Royale and Senator A platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Monza and modified accessory drive layouts in the Senator—and from 1982 the oil pump and camshaft were updated to address wear concerns, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The CIH 3.0L E S's primary reliability risk is camshaft lobe wear, with elevated incidence in vehicles subjected to sustained high-RPM operation or infrequent oil changes. Vauxhall internal service data from 1984 indicated a notable rate of camshaft replacement before 150,000 km in affected fleets, while UK MOT records show increased emissions failures linked to misfires from valve train degradation. Extended oil change intervals and low-viscosity oils accelerate wear, making oil specification and service discipline critical.
Analysis derived from Vauxhall technical bulletins (1975–1986) and UK DVSA/MOT failure statistics (1990–2005). 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 CIH 3.0L E S offers smooth, torque-rich performance but early models (1975–1981) are prone to camshaft lobe wear if not maintained properly. Later revisions (post-1982) with improved oil pumps and cam metallurgy are more robust. Regular oil changes with 10W-40 mineral oil and avoiding sustained high-RPM driving greatly improve longevity.
Top issues include cam lobe/tappet wear, Bosch L-Jetronic airflow meter failure, coolant leaks from the timing cover gasket, and exhaust manifold stud corrosion. These are documented in Vauxhall service bulletins, especially TSB-79-04-01 for cam concerns.
The CIH 3.0L E S was used in the Royale (3.0 E/S, 1975–1978), Senator A (3.0 E, 1978–1986), and Monza (3.0 E, 1982–1986). It was not used in Cavalier, Astra, or smaller models, which used four-cylinder engines.
Yes. The CIH 3.0L responds well to performance camshafts (+10–15 kW), carburettor conversion (on early models), or upgraded L-Jetronic chips. The robust bottom end can handle moderate increases, but head gasket integrity and oil system capacity should be monitored. Forced induction is rare and not recommended without internal upgrades.
Typical consumption is ~14.5 L/100km (city) and ~9.2 L/100km (highway), or about 19 mpg UK combined in a Senator 3.0 E. Real-world figures range from 17–22 mpg (UK) depending on driving style and vehicle condition.
No. The CIH series is a non-interference engine. If the timing chain fails, piston-to-valve contact will not occur, though the engine will stop running. However, chain failure can still cause internal damage from loose components.
Vauxhall originally specified SAE 10W-40 mineral oil meeting API SF/CC. Modern high-detergent 10W-40 or 15W-40 oils are acceptable, but avoid low-viscosity synthetics in high-mileage engines as they may reduce critical oil pressure.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
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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.
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