The Volkswagen AQY is a 2,791 cc, V6 petrol engine produced between 2000 and 2005. It features a dual overhead camshaft (DOHC) design with 30 valves (five per cylinder) and variable intake manifold geometry. This configuration delivers smooth, linear power, with a peak output of 150 kW (204 PS) and 270 Nm of torque, making it suitable for larger, more premium models.
Fitted primarily to the Passat B5.5 and Audi A4 B6, the AQY was engineered for refined, effortless cruising an…
Volkswagen
Production years 2000–2005 meet Euro 3 standards .
The Volkswagen AQY is a 2,791 cc V6 petrol engine engineered for mid-size and executive sedans (2000-2005). It combines DOHC 30-valve architecture with a variable-length intake manifold to deliver broad, linear power and refined operation. Designed to meet Euro 3 standards, it prioritizes smoothness and strong top-end performance over ultimate fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,791 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 30‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.5 mm × 86.4 mm | |
Power output | 150 kW (204 PS) | |
Torque | 270 Nm @ 3,200 rpm | |
Fuel system | Bosch Motronic MPI (Multi-Point Injection) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.6:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven (requires inspection) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 178 kg |
The Volkswagen AQY was used in Volkswagen's B5.5 platform with longitudinal mounting. This engine shared its core architecture with Audi's 2.8L V6 units but featured unique engine management calibrations for Volkswagen applications. All adaptations are documented in OEM technical bulletins.
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The AQY's primary reliability risk is coolant system failure due to the plastic flange, with elevated incidence in high-mileage vehicles. Internal Volkswagen service data indicates this is a frequent cause of workshop visits. While the timing chain is robust, neglecting oil changes can lead to premature tensioner wear.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 AQY is a smooth and powerful engine, but long-term reliability depends on addressing the known plastic coolant flange issue and maintaining strict oil change intervals to prevent sludge. With these items managed, the AQY's robust chain-driven valvetrain can deliver very high mileage reliably.
The most frequent issues are coolant leaks from the plastic flange, ignition coil pack failures causing misfires, malfunctioning variable intake manifold runners leading to power loss, and oil sludge buildup from infrequent servicing. These are well-documented in Volkswagen service bulletins.
The AQY 2.8L V6 engine was used exclusively in the Volkswagen Passat B5.5 (2000-2005). It was not used in Golf, Jetta, or other smaller Volkswagen models, being reserved for the larger Passat sedan and wagon.
Aftermarket ECU tuning is common on the AQY platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is modest for a V6. Expect around 10.5-12.0 L/100km (24-27 mpg UK) in mixed driving for a Passat 2.8 V6. Highway cruising can yield 8.5-9.5 L/100km (30-33 mpg UK), while city driving will be higher, around 13.0-15.0 L/100km (19-22 mpg UK).
Yes. The AQY is an interference engine. If the timing chain were to fail catastrophically (a rare event), the pistons would collide with the open valves, causing severe internal damage. However, the chain is very robust and designed to last the engine's lifetime with proper maintenance.
Volkswagen specifies oil meeting the VW 502 00 standard, typically a 5W-40 synthetic. Using the correct specification is vital for preventing sludge and ensuring the longevity of the hydraulic chain tensioner and tappets. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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