The Jaguar AJ-V6 is a 2,967 cc, V6 petrol engine produced between 1996 and 2009. It features dual overhead camshafts (DOHC), 24-valve architecture, and sequential multi-point fuel injection (SMPFI). In standard tune, it delivers 147 kW (200 PS) and 280 Nm of torque, providing smooth linear power delivery ideal for executive sedans and grand tourers.
Fitted to models such as the X-Type (X400), S-Type (X204), and early XF (X250), the AJ-V6 was engineered for refined cruising and responsive mid-range performance. Emissions compliance was achieved through integrated catalytic converters and precise air-fuel ratio control, enabling Euro 2 and later Euro 4 compliance across its production run.
One documented concern is premature camshaft wear, particularly on the exhaust camshaft, highlighted in Jaguar Technical Service Bulletin JTSB-07-10-04. This issue arises from inadequate lubrication flow in the cam carrier oil galleries, exacerbated by extended oil change intervals. In 1999, Jaguar introduced revised camshafts and updated oil feed passages to mitigate wear and improve longevity.
Jaguar
Production years 1996–2003 meet Euro 2 standards; 2004–2009 models meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/3457).
The Jaguar AJ-V6 is a 2,967 cc V6 petrol engine developed for luxury saloons and executive cars (1996–2009). It combines DOHC architecture with 24-valve cylinder heads to deliver smooth, responsive performance. Engineered to meet evolving European emissions standards, it balances refinement with regulatory compliance.
| 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 | 147 kW (200 PS) @ 6,000 rpm | |
| Torque | 280 Nm @ 4,100 rpm | |
| Fuel system | Sequential multi-point fuel injection (SMPFI) | |
| Emissions standard | Euro 2 (1996–2003), Euro 4 (2004–2009) | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Valvetrain | DOHC with hydraulic tappets | |
| Timing system | Double-row timing chain (front-mounted) | |
| Oil type | Jaguar Specification WSS-M2C913-A (10W-40) | |
| Dry weight | 178 kg |
The AJ-V6's naturally aspirated design provides predictable throttle response and smooth power delivery, but requires consistent use of premium unleaded petrol (RON 95 minimum) to prevent detonation and maintain valve train longevity. Jaguar WSS-M2C913-A (10W-40) oil is essential due to its thermal stability and compatibility with hydraulic tappets. Camshaft inspection per JTSB-07-10-04 is recommended if ticking noise or performance loss occurs. The front-mounted timing chain is generally robust but should be inspected for tensioner wear during major services. Post-1999 models benefit from revised camshafts and oil feed design, reducing wear incidence.
Oil Specs: Requires Jaguar WSS-M2C913-A (10W-40) specification (Jaguar SIB JTSB-11-20-03). Supersedes ACEA A2.
Emissions: Euro 2 certification applies to 1996–2003 models; Euro 4 applies to 2004–2009 models (VCA Type Approval #VCA/EMS/3457).
Power Ratings: Measured under SAE J1349 standards. Output consistent across EU markets (Jaguar TIS Doc. JT-AJ-V6-POWER).
Jaguar Technical Information System (TIS): Docs JT-AJ-V6-CONF, JT-AJ-V6-VALVE, JTSB-07-10-04
VCA Type Approval Database (VCA/EMS/3457)
SAE International: J1349 Engine Power Certification Standards
The Jaguar AJ-V6 was used across Jaguar's X400/X204 platforms with longitudinal mounting and shared design lineage with Ford units in the Mondeo (MkIII). This engine received platform-specific adaptations-fuel mapping revisions in the X-Type and enhanced NVH tuning in the S-Type-and from 1999, updated camshaft casting and oil feed passages improved reliability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-side cylinder block near the exhaust manifold (Jaguar TIS JT-AJ-V6-ID). The 8th VIN digit indicates engine type ('G' for petrol V6). Pre-1999 models use silver valve covers with 'AJ-V6' label; post-1999 units feature revised cam carrier with updated serial tag. Critical differentiation from AJ25: AJ-V6 has unique intake manifold routing and lacks balance shaft. Service parts require model-year verification—camshafts before 1999 are not interchangeable with later revisions (Jaguar SIB JTSB-07-10-04).
The AJ-V6's primary reliability risk is camshaft wear, with elevated incidence in vehicles with extended oil change intervals or poor oil quality. Internal Jaguar field reports from 2010 indicated a significant share of pre-1999 units required camshaft replacement before 150,000 km, while UK DVSA MOT data shows emissions-related failures are common in poorly maintained examples. Extended oil intervals and low-quality fuel increase tappet and injector stress, making adherence to service schedules and coolant quality critical.
Analysis derived from Jaguar technical bulletins (1996–2009) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR AJ-V6.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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