The Audi AZA is a 2,771 cc, V6 petrol engine produced between 1997 and 2000. It features a double overhead camshaft (DOHC) valvetrain and sequential multi — port fuel injection, delivering smooth power delivery and strong mid — range performance. In standard tune, it produces 132 kW (180 PS) with 255 Nm of torque, primarily used in Audi's executive and performance — oriented models.
Fitted to models such as the B5 A4, C5 A6, and A6 Avant, the AZA was engineered for balanced perf…
Production years 1997–2000 meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/4567).
The Audi AZA is a 2,771 cc V6 petrol engine engineered for executive and performance models (1997–2000). It combines DOHC architecture with sequential fuel injection to deliver smooth power and responsive mid-range torque. Designed to meet Euro 2 standards, it balances performance with drivability in all-weather conditions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,771 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.5 mm × 86.4 mm | |
Power output | 132 kW (180 PS) @ 5,800 rpm | |
Torque | 255 Nm @ 3,200 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | Euro 2 | |
Compression ratio | 10.3:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (front-mounted, interference design) | |
Oil type | Audi Longlife 00 (SAE 5W-40) | |
Dry weight | 175 kg |
The Audi AZA was used across Audi's B5/C5 platforms with longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifolds in the A4 and revised exhaust manifolds in the A6-and from 1999 the facelifted A6 Avant models adopted the updated AZA with modified cam profiles, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The AZA's primary reliability risk is timing belt tensioner failure on early builds, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2000 noted a significant number of pre-1999 engines requiring tensioner replacement before 120,000 km, while UK DVSA records show a moderate rate of emissions-related MOT failures linked to lambda sensor degradation. Extended service intervals and low oil levels increase tensioner and cam wear, making fluid quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (1997-2000) and UK DVSA failure statistics (2000-2005). 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 AZA is generally robust when maintained properly, but early models (1997-1998) are prone to timing belt tensioner issues. Later revisions (post-1999) incorporated design improvements, making them more durable. Regular oil changes with Audi Longlife 00 (5W-40) specification oil are essential to prevent tensioner and cam wear. Well-maintained examples can reliably exceed 180,000 km.
The most frequent issues include timing belt tensioner failure, intake manifold flap actuator cracking, ignition coil misfires, and oil leaks from the valve cover and rear main seal. These are documented in Audi service bulletins, particularly SIB 01 05 02 for the tensioner. Carbon buildup on spark plugs and injectors is also common on high-mileage engines.
The AZA 2.8L V6 was used in the B5-generation A4 (1997-2000), C5-generation A6 (1997-2000), and C5 A6 Avant (1997-2000). It was exclusively paired with quattro all-wheel drive in the Avant and available with front-wheel or quattro drive in the A4 and A6. All variants meet Euro 2 emissions standards.
Yes, though gains are more limited than turbocharged engines. ECU remapping can yield +10-20 kW by optimizing ignition and fuel maps. Supporting modifications like a performance exhaust, high-flow intake, and upgraded ignition components enhance results. However, the naturally aspirated design limits peak power; realistic stage 1 outputs reach around 160 kW (218 PS) safely.
Moderate for its class. In an A6 2.8, combined consumption is approximately 10.8 L/100 km (26.1 mpg UK). City driving may see 13–15 L/100 km (19–21 mpg UK), while highway runs can achieve 8.8 L/100 km (32 mpg UK). Real-world figures depend heavily on driving style, given the engine's responsiveness and torque curve.
Yes. The AZA is an interference engine, meaning that if the timing belt fails or jumps, the pistons can collide with open valves, resulting in severe internal damage. This underscores the importance of timely maintenance and immediate attention to any timing-related noises or warning lights.
Audi specifies SAE 5W-40 oil meeting Longlife 00 standards. This full-synthetic oil provides optimal protection for the timing belt tensioner and valvetrain under high-temperature operation. Oil changes should be performed every 15,000 km or annually, whichever comes first, to maintain engine longevity and prevent sludge buildup.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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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