The Aston Martin AJ37 is a 4,209 cc, V8 petrol engine produced between 2005 and 2016. It was developed in collaboration with Ford and Jaguar, based on the Ford InTech V8 architecture with significant revisions for Aston Martin applications. Featuring dual overhead camshafts (DOHC), 32 — valve configuration, and variable valve timing, it delivers high — revving performance with linear power delivery. In standard tune, it produced 298 kW (400 PS) and 410 Nm of torque, later…
Production years 2005–2008 meet Euro 4 standards; 2009–2016 models comply with Euro 5 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Aston Martin AJ37 is a 4,209 cc V8 petrol engine engineered for grand touring and sports coupé applications (2005–2016). It combines a lightweight aluminum block with DOHC 32-valve heads and variable valve timing to deliver high-revving performance and smooth power delivery. Designed to meet Euro 4 and Euro 5 emissions standards, it balances refined drivability with spirited acceleration.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,209 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.6 mm × 75.0 mm | |
Power output | 298–386 kW (400–525 PS) | |
Torque | 410–490 Nm @ 5,000 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | Euro 4 (pre-2009); Euro 5 (2009–2016) | |
Compression ratio | 10.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | N/A | |
Timing system | Chain-driven (dual overhead camshafts) | |
Oil type | Castrol Edge 5W-50 (Aston Martin Specification WSS-M2C947-A1) | |
Dry weight | 208 kg |
The Aston Martin AJ37 was used across Aston Martin's VH platform vehicles with longitudinal mounting and derived from Ford/Jaguar AJ-V8 architecture. This engine received model-specific calibrations-intake tuning in the V8 Vantage and revised exhaust manifolds in the DB9-and from 2010 the DB9 Series 2 adopted the AJ37 Gen III with higher compression and revised cam profiles, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The AJ37's primary reliability risk is intake manifold runner actuator failure on pre-2010 units, with elevated incidence in high-temperature climates. Internal Aston Martin service reports from 2011 indicated a significant number of early actuators failing before 100,000 km, while UK DVSA records show related fault codes contributing to emissions-related MOT failures. Stop-start driving and infrequent servicing increase wear, making use of reinforced replacement parts critical.
Analysis derived from Aston Martin technical bulletins (2005-2015) and UK DVSA failure statistics (2012-2020). 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 AJ37 is generally robust when properly maintained, but pre-2010 models are prone to intake actuator failures. Later revisions (post-2010) improved actuator durability. Regular oil changes with correct 5W-50 specification and coolant system maintenance are essential. Well-serviced engines can exceed 150,000 km without major issues.
The most frequent issues are intake manifold runner actuator failure (especially pre-2010), oil consumption in high-mileage engines, cooling system leaks, and throttle body motor wear. These are documented in Aston Martin service bulletins and supported by dealer repair records.
The AJ37 powered the DB9 (2005–2016), V8 Vantage (2005–2012), and Rapide (2010–2013). It was also used in early Jaguar XKR models (2006–2009) due to shared Ford/Jaguar architecture. Each application features model-specific tuning and intake systems.
Yes, though it is naturally aspirated. ECU remapping can yield +15–25 kW gains safely. Intake and exhaust upgrades improve breathing. Forced induction conversions exist but are complex. Tuning should preserve factory reliability and use high-octane fuel to prevent knock.
Moderate for a V8. In a DB9, expect ~13.5 L/100km (city) and ~8.2 L/100km (highway), or 21 mpg UK combined. The lighter V8 Vantage achieves slightly better economy. Real-world consumption depends heavily on driving style and fuel quality.
Yes. The AJ37 is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing catastrophic damage. Chain replacement is recommended every 120,000 km or 10 years, whichever comes first.
Aston Martin specifies Castrol Edge 5W-50 meeting WSS-M2C947-A1 standard. Oil must be changed every 15,000 km or 2 years. Using incorrect oil can accelerate cam and chain wear due to the high-pressure valve train design.
Comprehensive technical documentation and regulatory references
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ASTON-MARTIN 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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