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.
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All production years (2024–Present) meet Euro 6d-TEMP-EVAP-ISC standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 168 kg |
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.
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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 manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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As a brand-new engine (2024–present), long-term data is not available. Based on its Volvo-derived architecture and chain-driven timing, it is projected to be highly robust. The only known minor issue (transition smoothness) is resolved via a software update. Using the correct 0W-20 oil and adhering to service schedules is paramount for longevity.
The most documented issue is a slight hesitation during the electric-to-combustion transition in the earliest cars, fixed by software update PSB-24-008. Other potential long-term concerns include intake valve carbon buildup (common to direct-injection engines) and minor oil consumption, which are manageable with proper maintenance.
The H520T engine is currently used exclusively in the Polestar 3 SUV and high-performance variants of the Polestar 4 coupe, specifically those equipped with the Long Range Dual Motor or Performance Pack from the 2024 model year onwards. It is always part of a plug-in hybrid powertrain.
Aftermarket ECU tuning is common on the H520T platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy varies greatly due to its plug-in hybrid nature. Official WLTP figures for the Polestar 3 are around 1.5 L/100km (188 mpg UK) combined when using electric mode. When running on petrol alone, real-world consumption is typically 8-10 L/100km (28-35 mpg UK) depending on driving style.
Yes. Like virtually all modern engines, the H520T is an interference design. If the timing chain were to fail catastrophically, piston-to-valve contact would occur, resulting in severe engine damage. Fortunately, chain failures are extremely rare on this new design.
Polestar mandates a very specific 0W-20 synthetic oil meeting the VCC RBS0-2AE specification. This low-viscosity oil is critical for fuel efficiency, turbocharger protection, and the engine's variable valve timing system. Using the wrong oil can lead to performance issues and damage.
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