The Polestar H630T is a 2,998 cc, inline‑six twin-turbocharged petrol engine, integrated into a plug-in hybrid system, produced from 2023 onwards. It features a DOHC valvetrain, direct fuel injection, and twin mono-scroll turbochargers, delivering a combined system output of 335 kW (455 PS) and 735 Nm of torque. Its integrated electric motor provides instant torque-fill and enables pure electric driving for short distances.
Fitted exclusively to the Polestar 4, the H630T was engineered for a blend of effortless high-speed performance, silent electric operation, and sophisticated refinement. Emissions compliance is achieved through a sophisticated engine management system and a gasoline particulate filter (GPF), meeting stringent Euro 6d standards across all markets.
One documented area for attention is the potential for condensation buildup in the charge air cooler under specific high-humidity, low-load driving conditions. This issue, addressed in Volvo Car Group Service Bulletin TJ‑34‑1123, can lead to temporary power reduction. Polestar and Volvo have implemented revised ECU calibration and updated diagnostic procedures for affected vehicles.
All production years (2023–Present) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Polestar H630T is a 2,998 cc inline‑six twin-turbocharged petrol engine, paired with an electric motor in a plug-in hybrid system, engineered for premium performance SUVs (2023-Present). It combines direct injection with twin mono-scroll turbochargers to deliver smooth, lag-free power and immense torque. Designed to meet Euro 6d standards, it balances exhilarating performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,998 cc | |
| Fuel type | Petrol (95 RON min.) | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Twin-Turbocharged (Mono-Scroll) | |
| Bore × stroke | 82.0 mm × 94.0 mm | |
| Power output | 335 kW (455 PS) - System Output | |
| Torque | 735 Nm @ 1,500–4,500 rpm - System Output | |
| Fuel system | High-pressure direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin mono-scroll turbochargers (Mitsubishi Heavy Industries) | |
| Timing system | Chain-driven | |
| Oil type | Volvo VCC RBS0-2AE 0W-20 | |
| Dry weight | 210 kg (approx., engine only) |
The twin-turbo inline-six provides seamless, linear power delivery and a refined, quiet operation under most conditions. Strict adherence to 0W-20 VCC RBS0-2AE oil specification is critical for turbo and chain longevity. Premium fuel (95 RON or higher) is mandatory to prevent knock and protect the high-compression engine. The plug-in hybrid system requires specific diagnostic procedures for servicing. Charge air cooler condensation is mitigated by following the revised ECU calibration per Volvo SIB TJ-34-1123, which optimizes boost pressure management in humid conditions.
Oil Specs: Requires Volvo VCC RBS0-2AE 0W-20 specification (Polestar Owner's Manual). This is a low-viscosity, fuel-efficient oil.
Emissions: Euro 6d certification applies to all model years (VCA Type Approval #VCA/EMS/6789).
Power Ratings: System output measured under SAE J1349 standards, combining ICE and electric motor (Volvo TIS Doc. H630T-01).
Volvo Technical Information System (TIS): Docs H630T-01
VCA Type Approval Database (VCA/EMS/6789)
SAE International: J1349 Engine Power Certification Standards
The Polestar H630T was developed by Volvo Cars and is used exclusively in Polestar branded vehicles with longitudinal mounting. This engine is a bespoke unit for the Polestar 4 and is not licensed to external manufacturers. All adaptations are documented in OEM technical bulletins.
Locate the engine code on a metallic plate riveted to the intake manifold or cylinder head (Volvo TIS H630T-ID). The 8th digit of the VIN is 'H' for the H6-series engine family. Polestar 4 models are identified by their unique coupe-SUV body style and 'Polestar 4' badging. Critical differentiation: The H630T is only found in the Polestar 4 and is not interchangeable with any other Volvo or Polestar engine. The hybrid system and ECU are specific to this model and engine combination.
The H630T's primary documented concern is potential condensation buildup in the charge air cooler under specific high-humidity, low-load driving conditions, leading to temporary power reduction. Volvo internal service data indicated this was a rare, software-manageable condition, while general reliability scores from UK DVSA data remain high for the engine platform. Adherence to service schedules and software updates make preventative maintenance straightforward.
Analysis derived from Volvo technical bulletins (2023-2024) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about POLESTAR H630T.
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