The Polestar B6304T2 is a 2,951 cc, inline‑six turbocharged petrol engine produced between 2020 and 2024. It features a twin‑scroll turbocharger, direct fuel injection, and dual overhead camshafts (DOHC), delivering outputs ranging from 310 kW (420 PS) to 335 kW (455 PS) with torque figures between 660–740 Nm. The twin‑scroll turbocharger minimizes lag for immediate throttle response.
Fitted exclusively to the Polestar 1, this engine was engineered as part of a plug‑in hybrid powertrain for grand touring, emphasizing effortless power delivery and refined performance. Emissions compliance was achieved through a gasoline particulate filter (GPF) and sophisticated engine management, meeting Euro 6d‑TEMP standards at launch.
One documented concern is potential oil consumption in high‑performance driving cycles, addressed in Polestar Service Bulletin PSB‑2022‑08. This is linked to the aggressive ring‑pack design optimized for power. Polestar issued revised piston rings for affected vehicles under warranty.
Production years 2020–2024 meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/5678).
The Polestar B6304T2 is a 2,951 cc inline‑six turbocharged petrol hybrid engine engineered for the Polestar 1 grand tourer (2020-2024). It combines direct injection with a twin‑scroll turbocharger to deliver immense, linear power and torque. Designed to meet Euro 6d-TEMP standards, it forms the combustion component of a sophisticated plug-in hybrid system.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,951 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Twin‑scroll turbocharged | |
| Bore × stroke | 82.0 mm × 93.0 mm | |
| Power output | 310–335 kW (420–455 PS) | |
| Torque | 660–740 Nm @ 2,200–5,400 rpm | |
| Fuel system | High-pressure direct injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single twin‑scroll unit (BorgWarner) | |
| Timing system | Chain-driven | |
| Oil type | Polestar/Volvo VCC RBS0-2AE (SAE 0W-20) | |
| Dry weight | 215 kg |
The twin-scroll turbo provides immense, linear power ideal for high-speed cruising but demands premium 98 RON fuel to prevent knock and maintain performance. Polestar/Volvo VCC RBS0-2AE (0W-20) oil is critical for its low-viscosity formulation protecting turbo bearings and chain components. Extended high-RPM operation may accelerate oil consumption; owners should monitor levels between services. The GPF requires periodic highway driving to regenerate; frequent short trips can trigger warning lights. Revised piston rings are available per Polestar SIB PSB-2022-08 for excessive consumption cases.
Oil Specs: Requires Polestar/Volvo VCC RBS0-2AE (0W-20) specification (Polestar SIB PSB-2022-08).
Emissions: Euro 6d-TEMP certification applies to all 2020-2024 Polestar 1 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Peak output requires 98 RON fuel (Polestar Owner's Manual).
Volvo Technical Information System (TIS): Docs V24680, V25142
Polestar Service Information Bulletins (PSB-2022-08)
VCA Type Approval Database (VCA/EMS/5678)
The Polestar B6304T2 was used exclusively in the Polestar 1 with longitudinal mounting. This engine, derived from Volvo's B6304T family, received specific adaptations for the Polestar 1's hybrid system-including a unique engine control unit and integration with the rear electric motors. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front left side of the cylinder block, near the timing cover (Volvo TIS V24890). The VIN 8th digit is 'B' for this engine family. Visually, it is identifiable by its unique hybrid system wiring loom and the 'Polestar Engineered' plaque on the carbon fiber intake cover. Critical differentiation from standard Volvo B6304T engines: The B6304T2 has a specific ECU calibration and is only paired with the AWD hybrid drivetrain. Service parts are specific to the Polestar 1 and not interchangeable with Volvo S90/V90 applications.
The B6304T2's primary reliability consideration is potential oil consumption under aggressive driving, documented in early production units. Polestar SIB PSB-2022-08 outlines the condition, while owner reports suggest it is manageable with vigilant monitoring. Sustained high-RPM operation makes regular oil level checks critical.
Analysis derived from Polestar technical bulletins (2020-2024) and UK DVSA failure statistics (2021-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about POLESTAR B6304T2.
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