The Jaguar EC is a 2,967 cc, naturally aspirated V6 petrol engine produced between 2006 and 2010. Part of Jaguar's AJ — V6 family, it features double overhead camshafts (DOHC), variable valve timing (VVT), and sequential multi — point fuel injection (SMPFI). In standard tune, it delivers 177 kW (240 PS) and 283 Nm of torque, providing smooth linear power delivery ideal for grand touring applications.
Fitted to models such as the XF (X250 pre — facelift), S — Type (X204), and XJ…
Jaguar
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/6789).
The Jaguar EC is a 2,967 cc V6 petrol engine designed for executive sedans and luxury saloons (2006–2010). It combines DOHC architecture with variable valve timing to deliver smooth power delivery and high-revving capability. Engineered to meet Euro 4 standards, it balances refinement with regulated emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,967 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 89.0 mm × 79.5 mm | |
Power output | 177 kW (240 PS) @ 6,500 rpm | |
Torque | 283 Nm @ 4,100 rpm | |
Fuel system | Sequential multi-point fuel injection (SMPFI) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Valvetrain | DOHC with variable valve timing (VVT) | |
Timing system | Double-row roller chain (front-mounted) | |
Oil type | Jaguar Specification WSS-M2C913-A (5W-30) | |
Dry weight | 182 kg |
The Jaguar EC was used across Jaguar's X250/X204 platforms with longitudinal mounting and shared design lineage with Land Rover units in the LR2 (L334). This engine received platform-specific adaptations-fuel mapping revisions in the S-Type and enhanced NVH tuning in the XJ-and from 2008, updated throttle body calibration improved reliability. All adaptations are documented in OEM technical bulletins.
The EC's primary reliability risk is throttle body degradation, with elevated incidence in vehicles with frequent short-trip usage. Internal Jaguar field reports from 2009 indicated a significant share of pre-2008 units required throttle body replacement before 100,000 km, while UK DVSA MOT data shows emissions-related failures are common in poorly maintained examples. Extended oil intervals and low-quality fuel increase VVT and injector stress, making adherence to service schedules and fuel quality critical.
Analysis derived from Jaguar technical bulletins (2006–2010) and UK DVSA failure statistics (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 EC engine is generally robust with smooth power delivery, but pre-2008 models had reliability concerns, particularly throttle body failures. Later revisions (post-2008) improved actuator durability through updated design and calibration. Well-maintained examples with regular servicing, proper oil (5W-30 WSS-M2C913-A), and use of premium fuel can achieve high mileage without major issues.
Key issues include throttle body wear leading to idle instability, VVT solenoid clogging, intake carbon buildup, and coolant leaks from the thermostat housing. These are documented in Jaguar service bulletins. Regular maintenance, use of quality fuel, and timely throttle cleaning help prevent most failures.
The EC engine was used in the Jaguar XF (X250, 2006–2010), S-Type (X204, 2006–2008), and XJ (X350, 2006–2009) as the 3.0 V6. It was also used in the Land Rover Range Rover Sport (L320, 2006–2010). All models meet Euro 4 emissions standards.
Yes, the EC is moderately tunable. ECU remaps can safely increase output by +15–25 kW on stage 1, leveraging the high-revving V6 architecture. However, over-tuning without supporting modifications (intake, exhaust, cooling) can lead to detonation. Higher stages require forged internals and aggressive cam profiles for optimal results.
In a 2008 XF 3.0 V6, typical consumption is ~13.5 L/100km (city) and ~7.8 L/100km (highway), or about 21 mpg UK combined. Real-world figures vary, but 18–22 mpg (UK) is achievable with mixed driving. Fuel economy is competitive for its class and engine type.
Yes. The EC is an interference engine, meaning piston-to-valve contact occurs if the timing chain fails. The front-mounted chain is generally durable, but any signs of rattle or tensioner wear should be addressed immediately to prevent catastrophic internal damage.
Jaguar specifies 5W-30 synthetic oil meeting WSS-M2C913-A specification. This oil is critical for VVT actuator longevity and thermal stability. Change intervals should not exceed 15,000 km or 12 months, with more frequent changes advised for severe driving conditions.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
JAGUAR 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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