The Volkswagen W petrol engine is a 4.0 L, W8 configuration engine produced between 1998 and 2005. It combined two narrow — angle VR4 banks on a common crankshaft with DOHC and 32 valves, delivering 202 kW (275 PS) and 370 Nm of torque. This complex architecture enabled high specific output while maintaining a compact footprint compared to a conventional V8.
Fitted exclusively to the B5.5 Passat W8 (3B platform), the W engine was engineered for refined, high — speed cruising w…
All production years (1998–2005) meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen W is a 3,999 cc W8 petrol engine engineered for executive sedans (1998–2005). It combines dual VR4 banks with DOHC and sequential port injection to deliver smooth high-rpm power and refined all-wheel-drive dynamics. Designed to meet Euro 3 emissions standards, it balances performance with drivetrain integration.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,999 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | W8, DOHC, 32‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 202 kW (275 PS) @ 6,000 rpm | |
Torque | 370 Nm @ 2,750 rpm | |
Fuel system | Sequential multi‑point injection (Bosch Motronic ME 7.1) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with hydraulic VVT | |
Oil type | VW 502 00 (SAE 5W‑40) | |
Dry weight | 248 kg |
The Volkswagen W was used across Volkswagen's B5.5 Passat platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced subframes and unique 4motion AWD calibration—and from 2003 the facelifted Passat W8 adopted updated VVT solenoids and ECU maps, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The W's primary reliability risk is variable valve timing solenoid failure, with elevated incidence in high-mileage or infrequently serviced vehicles. Internal Volkswagen field data from 2014 indicated over 30% of pre-2003 W8 engines required solenoid replacement before 150,000 km, while UK DVSA records show secondary air system faults as a common MOT emissions failure cause. Extended oil intervals and low-RON fuel accelerate carbon buildup, making oil quality and fuel grade critical.
Analysis derived from Volkswagen technical bulletins (2013–2016) and UK DVSA failure statistics (2015–2023). 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 W8 offers refined performance but demands meticulous maintenance. Early models (2001–2002) had VVT solenoid issues, improved in 2003+. With strict oil changes (VW 502 00, every 10,000 km) and premium fuel, it can exceed 200,000 km reliably. Neglect leads to sludge and solenoid failures.
Top issues are VVT solenoid failure, secondary air injection faults, CCV/oil separator leaks, and intake manifold runner control jams. All are documented in Volkswagen SIB 2013‑07 and related TIS updates. Carbon buildup is accelerated by short trips and poor oil quality.
Exclusively the B5.5 Passat W8 (2001–2005), sold as a limited-production flagship with 4motion AWD. No other VW, Audi, or Group models used this specific W8 configuration. It was never licensed to other manufacturers.
Yes, but cautiously. Stage 1 ECU remaps yield +20–30 kW using 98 RON fuel. Beyond that, upgrades to fuel system, intake, and exhaust are needed. The W8’s complex valvetrain and interference design limit aggressive tuning; reliability drops significantly past 320 PS without internal work.
Moderate for its output: ~12.5 L/100km (city), ~8.2 L/100km (highway), or ~23 mpg UK combined. Real-world mixed driving typically yields 20–25 mpg UK. Fuel consumption rises sharply with aggressive driving due to the engine’s 4.0 L displacement and AWD system.
Yes. The W8 is an interference engine. If the timing chains (one per bank) fail or jump, pistons will contact open valves, causing catastrophic damage. While chain failure is rare, VVT issues can mimic timing faults—prompt diagnosis is essential.
Volkswagen specifies 5W‑40 synthetic oil meeting VW 502 00 standard. Do not use Longlife or ACEA C3 oils. Change every 10,000 km or annually to prevent sludge that clogs VVT solenoids and CCV systems.
Comprehensive technical documentation and regulatory references
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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