The Volvo B6304T2 is a 2,922 cc, inline‑six turbocharged petrol engine produced between 1998 and 2005. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and a low — pressure turbocharger, delivering outputs of 162 kW (220 PS) and 320 Nm of torque. Its robust cast — iron block provides a strong foundation for everyday drivability and smooth power delivery.
Fitted primarily to the S80 (1998–2005) and XC90 (2003–2005) models, the B6304T2 was engineer…
Production years 1998–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/VOL/6789).
The Volvo B6304T2 is a 2,922 cc inline‑six turbocharged petrol engine engineered for luxury sedans and SUVs (1998-2005). It combines DOHC with variable valve timing to deliver smooth, linear power and refined cruising. Designed to meet Euro 3 standards, it balances performance with acceptable emissions for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,922 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Turbocharged (low pressure) | |
Bore × stroke | 81.0 mm × 90.0 mm | |
Power output | 162 kW (220 PS) | |
Torque | 320 Nm @ 2,700 rpm | |
Fuel system | Sequential multi-point injection | |
Emissions standard | Euro 3 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett T25 (low pressure) | |
Timing system | Chain-driven | |
Oil type | Volvo VCC 95200312 (SAE 10W‑30) | |
Dry weight | 185 kg |
The Volvo B6304T2 was used across Volvo's P2 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the XC90 for SUV duty-and no significant facelift revisions affecting core compatibility occurred during its production. All adaptations are documented in OEM technical bulletins.
The B6304T2's primary reliability risk is electronic throttle module (ETM) failure, with elevated incidence in high-mileage or dusty environments. Volvo internal service data indicated a significant portion of 1998-2001 models required ETM replacement, while UK DVSA records show related drivability faults as a common MOT advisory item. Infrequent driving and poor air filtration can accelerate carbon buildup, making proactive cleaning or module replacement critical.
Analysis derived from Volvo technical bulletins (1999-2005) and UK DVSA failure statistics (2010-2023). 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
The B6304T2 is fundamentally robust thanks to its iron block, but its Achilles' heel is the electronic throttle module (ETM), especially in early models (1998-2001). With the ETM issue addressed and regular maintenance, these engines can easily surpass 200,000 km. Using the correct oil and coolant is essential for longevity.
The most frequent issues are ETM failure causing drivability problems, oil leaks from the turbo lines, and coolant leaks from aging plastic components. IMRC actuator faults are also common. These are well-documented in Volvo service bulletins and owner communities.
The B6304T2 was used in the first-generation Volvo S80 (1998-2005) and the first-generation Volvo XC90 (2003-2005), specifically in the '2.9T' trim level for both models. It was not used in any other Volvo vehicles or licensed to other manufacturers.
Yes, but with caution. The low-pressure turbo limits significant gains. ECU remaps can yield modest increases (+15-25 kW), but the stock internals are not designed for high boost. Upgrading the turbo, intercooler, and fuel system is necessary for substantial power, which can compromise reliability.
Fuel economy is moderate for its size and era. Expect around 12.5 L/100km (23 mpg UK) in city driving and 8.5 L/100km (33 mpg UK) on the highway in an S80. Real-world combined figures typically range from 25-28 mpg UK, depending heavily on driving style.
Yes. The B6304T2 is an interference engine. If the timing chain fails or jumps, the pistons will collide with the open valves, resulting in catastrophic engine damage. While the chain is generally durable, it should be inspected if the engine is high-mileage.
Volvo specifies a 10W-30 synthetic or semi-synthetic oil meeting their VCC 95200312 standard. Using the correct viscosity is crucial for protecting the turbocharger bearings and ensuring proper lubrication of the timing chain system. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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VOLVO Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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