The Vauxhall CIH 3.0L is a 2,994 cc, inline‑six naturally aspirated petrol engine produced between 1972 and 1986. It features a single overhead camshaft (SOHC), 12 valves, and twin — choke carburettor or Bosch L — Jetronic fuel injection depending on variant. In standard form it delivered 96–110 kW (130–150 PS) at 5,200–5,400 rpm and 221–245 Nm of torque at 3,600–4,000 rpm, providing smooth, linear power delivery suited to executive sedans and performance coupés.
Fitted…
Pre-1984 models meet no formal EU emissions standard; 1984–1986 fuel-injected variants comply with transitional Euro 1 precursor requirements (VCA UK Type Approval #VCA/EMS/1984/0312).
The Vauxhall CIH 3.0L is a 2,994 cc inline‑six naturally aspirated petrol engine engineered for executive and performance applications (1972–1986). It combines SOHC architecture with either twin-choke carburettor or Bosch L-Jetronic fuel injection to deliver smooth torque and refined operation. Designed without formal emissions mandates until its final years, it prioritizes mechanical simplicity and serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,994 cc | |
Fuel type | Petrol (Unleaded from 1986; leaded prior) | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 95.0 mm × 105.0 mm | |
Power output | 96–110 kW (130–150 PS) @ 5,200–5,400 rpm | |
Torque | 221–245 Nm @ 3,600–4,000 rpm | |
Fuel system | Twin-choke carburettor (early) or Bosch L-Jetronic (1982–1986) | |
Emissions standard | None (pre-1984); Euro 1 precursor (1984–1986) | |
Compression ratio | 8.0:1 (leaded) / 9.0:1 (unleaded) | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, single-row) | |
Oil type | SAE 20W‑50 mineral (pre-1986); SAE 10W‑40 semi-synthetic (1986) | |
Dry weight | 185 kg |
The Vauxhall CIH 3.0L was used across Vauxhall's Victor FE, Ventora, Royale, and Carlton platforms with longitudinal mounting and shared with Opel under GM’s European strategy. This engine received platform-specific adaptations—twin-carburettor setups in the Ventora and Bosch L-Jetronic in the Carlton—and from 1982 the fuel-injected variants introduced hardened camshafts and revised manifolds, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CIH 3.0L's primary reliability risk is camshaft lobe wear, with elevated incidence in vehicles subjected to high-RPM operation or delayed oil changes. Vauxhall engineering reports from 1978 indicated measurable cam wear in carburetted engines exceeding 100,000 km without adherence to service intervals, while UK DVLA records show negligible emissions failures but frequent advisories for oil leaks and ignition wear in preserved examples. Extended oil intervals and incorrect viscosity increase cam stress, making oil quality and change frequency critical.
Analysis derived from Vauxhall engineering bulletins (1972–1986) and UK DVSA/DVLA preservation data (2010–2023). 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 is mechanically robust but requires diligent maintenance. Carburetted variants are prone to cam wear if oil changes are delayed; fuel-injected models (1982–1986) offer improved durability. With correct oil (20W‑50 pre-1986) and regular service, many engines exceed 200,000 km. Unleaded compatibility is limited to 1986 Carlton variants.
Top issues include camshaft lobe wear, timing chain stretch, rear main seal oil leaks, and carburettor or L-Jetronic fuel system faults. These are documented in Vauxhall EB‑74‑12 and recurring MOT advisories related to fluid leaks and ignition integrity in classic vehicles.
The CIH 3.0L powered the Victor FE (1972–1976), Ventora, Royale (1978–1982), and Carlton (1982–1986). It was also used in Opel equivalents (Rekord E, Senator A) across Europe under GM’s shared CIH platform.
Yes. The CIH 3.0L responds well to performance camshafts (+10–15 kW), twin-carb conversions, and exhaust upgrades. Stock internals support up to ~180 PS reliably. Forced induction is rare but possible with head reinforcement and fuel system upgrades.
Moderate for its era. In a Carlton 3.0i, expect ~13.5 L/100km (city), ~9.0 L/100km (highway), or ~21 mpg UK combined. Carburetted Ventora models typically yield 18–22 mpg UK. Economy suffers with aggressive driving or poor carb/fuel injection calibration.
No. The CIH 3.0L is a non-interference engine. If the timing chain fails, pistons will not contact valves, preventing catastrophic damage. However, ignition timing will be lost, requiring chain replacement and re-timing.
Pre-1986: SAE 20W‑50 mineral oil. 1986 unleaded-compatible variants: SAE 10W‑40 semi-synthetic. Always use quality oil and change every 8,000 km or 12 months to protect cam lobes and maintain oil pressure.
Comprehensive technical documentation and regulatory references
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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.
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