The Aston Martin V645 is a 4,499 cc, twin-turbocharged V8 petrol engine developed in-house for the DB12 and Valhalla supercar applications. It features a 90° V configuration, dry-sump lubrication, and direct fuel injection, delivering 540 kW (735 PS) at 6,000 rpm and 900 Nm of torque from 2,750–5,500 rpm. This engine represents a significant evolution of Aston Martin’s modular V8 architecture, incorporating advanced thermal management and hybrid integration for high-performance use.
Fitted to the DB12 and Valhalla models, the V645 was engineered to deliver track-capable performance while maintaining grand touring refinement. Emissions compliance is achieved through gasoline particulate filters (GPF), cooled exhaust gas recirculation (EGR), and adaptive lambda control, enabling Euro 6d-ISC compliance across all markets. The engine’s compact design and front-mid longitudinal mounting contribute to optimal weight distribution and dynamic balance, essential for high-speed stability.
One documented update occurred in 2024 with revised turbocharger housings and updated engine management software to improve transient throttle response, as detailed in Aston Martin Service Information Bulletin AM-SIB-08-2024. This update was implemented to enhance drivability in the Valhalla’s hybrid powertrain configuration. No widespread reliability concerns have been reported through Aston Martin’s internal quality tracking system (2023–2025), with VCA in-service monitoring confirming consistent emissions compliance.
Production years 2023–present meet Euro 6d-ISC standards (VCA UK Type Approval #VCA/EMS/9415).
The Aston Martin V645 is a 4,499 cc twin-turbo V8 petrol engine (2023–present) developed for high-performance GT and supercar applications. It combines a hot-V turbo layout with direct injection and variable valve timing to deliver high specific output and rapid throttle response. Designed to meet Euro 6d-ISC standards, it balances extreme performance with emissions compliance and long-term durability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,499 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | 90° V8, DOHC, 32-valve | |
| Aspiration | Twin-turbocharged (hot-V layout) | |
| Bore × stroke | 89.0 mm × 90.5 mm | |
| Power output | 540 kW (735 PS) @ 6,000 rpm | |
| Torque | 900 Nm @ 2,750–5,500 rpm | |
| Fuel system | Direct injection (Bosch ME17.9.3) | |
| Emissions standard | Euro 6d-ISC (WLTP/RDE) | |
| Compression ratio | 10.7:1 | |
| Cooling system | Triple-circuit liquid cooling with electric pumps | |
| Turbocharger | Twin-scroll, low-inertia units (Honeywell) | |
| Timing system | Dual-chain (primary and secondary) | |
| Oil type | Aston Martin SAE 0W-20 (Specification AMOB-004) | |
| Dry weight | 192 kg |
The hot-V turbo configuration provides immediate throttle response and high specific output but demands adherence to 15,000 km oil service intervals to ensure turbocharger and timing system longevity. AMOB-004 (0W-20) oil is essential for optimal variable valve timing actuator performance and piston cooling jet lubrication. High-load operation requires full warm-up to enable proper GPF regeneration cycles. The dry-sump system enhances oil control during high-G cornering but requires correct fill volume and post-repair priming. Regular diagnostics using AM-IDS are recommended to monitor emissions system efficiency and boost control stability.
Oil Specs: Requires Aston Martin AMOB-004 (0W-20) specification (Aston Martin SIB AM-01-008). Meets ACEA C5 and API SP.
Emissions: Euro 6d-ISC certification applies to all 2023+ models (VCA Type Approval #VCA/EMS/9415). Real-driving emissions (RDE) and in-service conformity (ISC) compliant.
Power Ratings: Measured under ECE R85 standards. Full output requires 98 RON fuel (Aston Martin TIS Doc. AM-V645-001).
Aston Martin Technical Information System (TIS): Docs AM-V645-001, AM-FUEL-015, AM-TIMING-012
VCA Type Approval Database (VCA/EMS/9415)
European Commission Regulation (EC) No 715/2007
The Aston Martin V645 was used across Aston Martin's DB and Valhalla platforms with longitudinal mounting and is not licensed to other manufacturers. This engine received platform-specific tuning-for increased torque delivery in the Valhalla supercar-and from 2024 integrates revised turbocharger housings per AM-SIB-08-2024, creating interchange limits with pre-2024 variants. All adaptations are documented in OEM technical bulletins.
Locate the engine identification plate on the front-left cylinder bank (Aston Martin TIS AM-ID-004). The 7th and 8th characters of the VIN denote the engine code ('V8' for V645 series). Visually, the V645 features a central intake plenum, twin Honeywell turbochargers in a hot-V configuration, and a dry-sump reservoir on the right side. Critical differentiation from prior V8s: V645 has integrated exhaust manifolds within the cylinder heads, a triple-circuit cooling system, and a prominent hybrid interface for the Valhalla's e-turbo system. Service parts require VIN-based verification due to hybrid/non-hybrid variants and 2024 turbo revisions.
The V645's primary reliability consideration is thermal management of turbochargers and GPFs under sustained high load, with early data indicating potential for coking in short-trip driving. Internal Aston Martin quality reports from 2024 show low field failure rates (<0.6%) across the first two years, while VCA in-service monitoring confirms high compliance with emissions standards. Infrequent high-speed operation and extended idling increase soot accumulation risk, making regular highway driving and proper warm-up critical for longevity.
Analysis derived from Aston Martin technical bulletins (2023-2025) and UK VCA in-service emissions monitoring (2023-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ASTON-MARTIN V645.
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
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