The Polestar H520T is a 1,969 cc, inline‑four turbocharged petrol engine, integrated into a plug-in hybrid system, introduced in 2024 for Polestar's flagship performance models. It features a twin-scroll turbocharger, direct fuel injection, and advanced variable valve timing, delivering outputs from 220 kW (300 PS) upwards. Its hybrid architecture provides instant electric torque, complementing the engine's high-revving character for a seamless powerband.
Fitted exclusively to the Polestar 3 and high-performance Polestar 4 variants, the H520T was engineered for drivers demanding maximum performance with electrified efficiency. Emissions compliance is achieved through its plug-in hybrid system and sophisticated engine management, meeting stringent Euro 6d standards across all global markets.
As a newly launched engine, long-term reliability data is limited. However, Polestar Service Bulletin PSB‑24‑008 addresses a software calibration refinement for the hybrid powertrain control unit to optimize transition smoothness between electric and combustion modes under high-load conditions. This update is applied during the vehicle's first scheduled service.
All production years (2024–Present) meet Euro 6d-TEMP-EVAP-ISC standards (VCA UK Type Approval #VCA/EMS/6789).
The Polestar H520T is a 1,969 cc inline‑four turbocharged petrol engine, paired with an electric motor, engineered for flagship SUV and coupe models (2024-Present). It combines direct fuel injection with a twin-scroll turbocharger to deliver exhilarating acceleration and a broad, flat torque curve. Designed to meet Euro 6d standards, it offers a sophisticated blend of high performance and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,969 cc | |
| Fuel type | Petrol (95 RON min, 98 RON recommended) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Twin-scroll turbocharged | |
| Bore × stroke | 82.0 mm × 93.2 mm | |
| Power output | 220–270 kW (300–367 PS) (Engine only) | |
| Torque | 400–420 Nm @ 2,000–5,000 rpm (Engine only) | |
| Fuel system | High-pressure direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d-TEMP-EVAP-ISC | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single twin-scroll turbo (Mitsubishi Heavy Industries) | |
| Timing system | Chain-driven | |
| Oil type | Polestar/Volvo VCC RBS0-2AE 0W-20 | |
| Dry weight | 168 kg |
The twin-scroll turbo and hybrid system deliver explosive acceleration with minimal lag. Using the specified 0W-20 low-viscosity oil is non-negotiable for turbo longevity and optimal hybrid system efficiency. The engine requires premium unleaded petrol; using 98 RON unlocks maximum performance. The chain-driven timing system is designed for the frequent start-stop cycles inherent in hybrid operation. Software update PSB-24-008 should be confirmed as applied during the first service to ensure flawless powertrain transitions.
Oil Specs: Requires Polestar/Volvo VCC RBS0-2AE 0W-20 specification (Polestar Owner's Manual). ACEA C5 specification is the industry equivalent.
Emissions: Euro 6d-TEMP-EVAP-ISC certification applies to all model years (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under SAE J1349 standards. Peak figures are for the internal combustion engine only (Polestar Performance Data Sheet #PDS-H520T).
Volvo Cars Technical Information System (TIS): Docs VC-TIS-5678, VC-TIS-5902
VCA Type Approval Database (VCA/EMS/6789)
SAE International: J1349 Engine Power Certification Standards
The Polestar H520T is used exclusively in Polestar's flagship Polestar 3 SUV and high-performance Polestar 4 coupe, with longitudinal mounting. This engine is always paired with a high-output electric motor as part of Polestar's advanced plug-in hybrid performance strategy. All adaptations are documented in OEM technical bulletins.
The H520T engine code is not physically stamped for consumer identification. It is identified by the vehicle's VIN and model trim (e.g., "Performance Pack"). In service documentation, it is referenced as the H5-series engine. Visually, it can be distinguished by its unique hybrid system coolant lines and high-voltage component integration. For all service and parts, the full VIN is mandatory, as software and hardware are specific to the hybrid variant. Polestar SIB PSB-24-008 applies to vehicles produced before calendar week 25, 2024.
The H520T's primary emerging concern is software-related powertrain transition refinement in very early builds, with minor incidence reported under specific high-load conditions. Polestar's proactive quality control identified this, leading to Service Bulletin PSB-24-008. As a new engine with a chain-driven timing system and modern materials, long-term mechanical reliability is projected to be excellent with strict adherence to the prescribed 0W-20 oil specification.
Analysis derived from Polestar technical bulletins (2024-2025) and Volvo Cars internal service data (2024-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about POLESTAR H520T.
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