The Range Rover 20 HC51AA is a 4,999 cc, twin-turbocharged V8 petrol engine produced between 2020 and 2024. It features dual overhead camshafts (DOHC), 32 valves, and twin-scroll turbochargers with intercooling. In standard form it delivered 423 kW (575 PS) and 750 Nm of torque, providing high-performance capability with immediate throttle response for flagship SUV applications.
Fitted to the L460 Range Rover and L461 Range Rover Sport—including Autobiography, SV, and SVR trims—the 20 HC51AA was engineered for seamless power delivery and dynamic handling. Emissions compliance was achieved through direct fuel injection, variable valve timing, gasoline particulate filters (GPF), and a close-coupled three-way catalytic converter system, meeting Euro 6d standards across all production years.
One documented concern is premature wear of the turbocharger wastegate actuator linkage, which can cause boost control instability and overboost conditions. This issue, highlighted in Land Rover Technical Service Bulletin LTB00723(22), is attributed to thermal fatigue in the original actuator pivot design. From early 2023, revised actuators with reinforced bushings were introduced to address this weakness.
All production years 2020–2024 meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9456).
The Range Rover 20 HC51AA is a 4,999 cc V8 twin-turbocharged petrol engine engineered for flagship luxury SUVs (2020–2024). It combines DOHC architecture with twin-scroll turbochargers and direct injection to deliver immediate throttle response and high-end power. Designed to meet Euro 6d emissions standards, it balances performance with modern regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,999 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | V8, DOHC, 32-valve | |
| Aspiration | Twin-turbocharged (twin-scroll) | |
| Bore × stroke | 95.5 mm × 87.0 mm | |
| Power output | 423 kW (575 PS) @ 6,000–6,500 rpm | |
| Torque | 750 Nm @ 2,250–5,000 rpm | |
| Fuel system | Direct injection (Bosch HDEV6.2) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled with triple electric fans and auxiliary oil cooler | |
| Turbocharger | Twin-scroll turbochargers (Honeywell Garrett) | |
| Timing system | Chain-driven DOHC with variable cam phasing | |
| Oil type | Land Rover STJLR.03.5037 (SAE 0W‑40) | |
| Dry weight | 225 kg |
The twin-turbo V8 delivers explosive acceleration and refined high-speed cruising but requires strict adherence to 16,000 km oil change intervals using 0W-40 specification to protect turbo bearings and timing chains. Land Rover STJLR.03.5037 (0W-40) oil is critical due to its high thermal stability and anti-wear additives. Extended high-load operation without adequate warm-up can accelerate wastegate actuator wear. The Bosch HDEV6.2 system requires OEM-level diagnostics for injector coding and rail pressure adaptation. Post-2023 engines include updated wastegate actuators per Land Rover SIB LTB00723(22); pre-2023 units should be retrofitted during turbo service. GPF efficiency must be monitored to maintain Euro 6d compliance.
Oil Specs: Requires Land Rover STJLR.03.5037 (0W-40) specification (Land Rover SIB LTB00723(22)). Equivalent to ACEA C5 with OEM-specific additives.
Emissions: Euro 6d certification applies to all 2020–2024 models (VCA Type Approval #VCA/EMS/9456).
Power Ratings: Measured under ISO 1585 standards. Power output verified on dynamometer per Land Rover PT-2023.
Land Rover Technical Information System (TIS): Docs V8-20HC51AA-01, LR-E66-842, SIB LTB00723(22)
VCA Type Approval Database (VCA/EMS/9456)
ISO 1585: Road vehicles — Engine test code
The Range Rover 20 HC51AA was used across Land Rover's L460 and L461 platforms with longitudinal mounting and shared with Jaguar for high-performance applications. This engine received platform-specific adaptations—enhanced cooling in the SVR and active engine mounts in the Autobiography—and from early 2023 the updated L460/L461 retained the same engine but with revised wastegate actuators, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-side cylinder head near the rear bank (Land Rover TIS V8-20HC51AA-01). The 7th VIN digit indicates engine family ('H' for 5.0L twin-turbo V8). Pre-2023 models use black wastegate actuators with polymer bushings; post-2023 units have silver actuators with metal-reinforced pivots. Critical differentiation from 16 HA35AL: 20 HC51AA uses Bosch HDEV6.2 with higher rail pressure and updated GPF; 16 HA35AL is based on earlier architecture. Service parts require production date verification—wastegate kits for engines before 03/2023 are incompatible with later units due to linkage redesign (Land Rover SIB LTB00723(22)).
The 20 HC51AA's primary reliability risk is turbocharger wastegate actuator wear on early builds, with elevated incidence in sustained high-load or track use. Land Rover internal data from 2023 indicated a notable share of pre-2023 engines required actuator replacement before 80,000 km, while UK DVSA records show GPF clogging contributing to reduced performance in short-trip urban driving. Aggressive driving without warm-up and infrequent oil changes accelerate wear, making oil quality and interval adherence critical.
Analysis derived from Land Rover technical bulletins (2020–2024) and UK DVSA failure statistics (2021–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RANGE-ROVER 20-HC51AA.
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