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…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
As a very new engine introduced in 2023, long-term data is limited. However, it is based on Volvo's proven engine architecture and has shown high initial reliability in DVSA data. The main documented issue (charge air cooler condensation) is software-related and has been addressed. With regular software updates and adherence to the maintenance schedule, it is expected to be very reliable.
The most frequently documented issues are software-related: temporary power reduction due to charge air cooler condensation (now fixed via update), 12V battery drain, inconsistent regenerative braking, and infotainment system reboots. These are typically resolved with software updates or standard component replacement.
The H630T engine is used exclusively in the Polestar 4 (2023-Present). It is not found in any Volvo models or other Polestar vehicles. It is a bespoke powertrain for this specific model.
Currently, tuning options are extremely limited due to the complexity of the hybrid system and locked ECU software. Any unauthorized modification risks damaging the powertrain and will void the warranty. It is expected that specialist tuners may develop safe, warranty-friendly solutions in the future, but none are officially endorsed yet.
Official WLTP figures for the Polestar 4 with the H630T powertrain are approximately 1.5 L/100km (188 mpg UK) and over 600 km of electric range. Real-world combined fuel consumption will vary greatly depending on driving style and how often the vehicle is charged, typically ranging from 8-12 L/100km (24-35 mpg UK) if not regularly plugged in.
Yes. Like virtually all modern DOHC engines, the H630T is an interference design. If the timing chain were to fail (which is highly unlikely with proper maintenance), significant internal engine damage would occur. The chain-driven system is designed for the life of the vehicle.
Polestar mandates the use of 0W-20 engine oil meeting the specific Volvo VCC RBS0-2AE specification. Using the correct low-viscosity oil is crucial for fuel economy, emissions, and protecting components like the turbochargers and timing chain. Do not substitute with other grades.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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