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 increased to 386 kW (525 PS) in evolved variants.
Fitted to key models including the DB9, V8 Vantage (2005–2012), and Rapide, the AJ37 was engineered for grand touring refinement and responsive driving dynamics. Its naturally aspirated design provided smooth throttle response and a distinctive exhaust note, while meeting Euro 4 and later Euro 5 emissions standards through sequential multi-port fuel injection and advanced ECU mapping. The engine's integration into Aston Martin's aluminum VH architecture ensured optimal weight distribution.
One documented update is the transition from the Bosch ME7.1.1 to the Bosch MD7 ECU in 2008, improving throttle response and emissions control (Aston Martin Engineering Bulletin AJ-08-001). Additionally, early models exhibited occasional intake manifold runner actuator failures due to plastic gear wear. From 2010, revised actuators with reinforced nylon gears were implemented across the range to improve durability.
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 naturally aspirated AJ37 provides linear throttle response ideal for grand touring, but requires strict adherence to 15,000 km oil change intervals using Castrol Edge 5W-50 to maintain valve train and chain longevity. The engine's Ford/Jaguar heritage ensures parts commonality with select Jaguar V8 units, though ECU and intake tuning are model-specific. Intake manifold runner actuators on pre-2010 units are prone to gear wear; replacement with post-2010 reinforced units is recommended. Fuel quality is critical—premium unleaded (RON 98) is required to prevent knock and preserve performance. Cooling system maintenance is essential due to tight underhood packaging; thermostat and hose inspections should be routine.
Oil Specs: Requires Castrol Edge 5W-50 meeting Aston Martin WSS-M2C947-A1 (Aston Martin SIB AJ-09-003). Supersedes ACEA A3/B4.
Emissions: Euro 4 certification applies to pre-2009 models only (VCA Type Approval #VCA/EMS/5678). Euro 5 compliance applies to 2009–2016 models depending on market.
Power Ratings: Measured under SAE J1349 standards. 386 kW output requires RON 98 fuel and revised ECU calibration (Aston Martin TIS Doc. AJ37-ECU-012).
Aston Martin Technical Information System (TIS): Docs AJ37-ENG-001, AJ37-ENG-002, SIB AJ-08-001
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine serial number stamped on the left-hand side of the cylinder block near the front cover (Aston Martin TIS AJ37-ID-001). The 7th VIN digit indicates engine type ('B' for AJ37 series). Pre-2008 units have silver cam covers with '4.2' badges; post-2010 models use black cam covers with '5.9' or model-specific badging. Critical differentiation from Jaguar AJ-V8: AJ37 features Aston Martin-specific intake manifolds, throttle bodies, and Bosch MD7 ECU (post-2008). Service parts require model-year verification—intake actuators before 2010 are incompatible with later units due to gear material upgrade (Aston Martin SIB AJ-10-002).
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.
Find answers to most commonly asked questions about ASTON-MARTIN AJ37.
Comprehensive technical documentation and regulatory references
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ASTON-MARTIN 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.
VCA Certification Portal
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