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 performance, refinement, and all-weather drivability. Its longitudinal mounting and quattro compatibility made it ideal for premium sedans and wagons. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, meeting Euro 2 standards across its production run.
One documented concern is premature wear of the timing belt tensioner, particularly on high-mileage units. This issue, referenced in Audi Technical Service Bulletin 01 05 02, is attributed to material degradation under sustained high-temperature operation. Later production revisions included updated tensioner design and revised belt routing to improve reliability and service life.
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 naturally aspirated V6 provides linear power delivery ideal for highway cruising but demands strict adherence to 90,000 km or 6-year timing belt replacement intervals to prevent catastrophic engine failure. Audi Longlife 00 (5W-40) oil is critical due to its thermal stability and protection of the front-mounted belt tensioner. Extended idling or frequent short trips can accelerate sludge buildup in the crankcase ventilation system. Fuel quality must meet EN 228 standards to prevent injector coking and misfires. Pre-1999 models should have the updated tensioner and revised belt routing per Audi SIB 01 05 02. The three-way catalytic converter requires full operating temperature for optimal efficiency; cold starts contribute disproportionately to emissions.
Oil Specs: Requires Audi Longlife 00 (5W-40) specification (Audi SIB 01 05 02). Supersedes ACEA A2/B2.
Emissions: Euro 2 certification applies to all models (1997–2000) (VCA Type Approval #VCA/EMS/4567).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities meeting EN 228 (Audi TIS Doc. A29480).
Audi Technical Information System (TIS): Docs A29040, A29260, SIB 01 05 02
VCA Type Approval Database (VCA/EMS/4567)
ISO 1585: Road vehicles — Engine test code — Net power
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.
Locate the engine code stamped horizontally on the left-side cylinder block near the exhaust manifold (Audi TIS A29065). The 8th VIN digit indicates engine type ('A' for 2.8 V6 AZA). Pre-1999 models have silver cam covers with ribbed intake manifolds; post-1999 units use black cam covers. Critical differentiation from similar engines: AZA has a front-mounted timing belt with a hydraulic tensioner, while the 2.4L V6 uses a different belt routing. Service parts require production date verification - tensioners for engines before 03/1999 are incompatible with later units due to internal redesign (Audi SIB 01 05 02).
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.
Find answers to most commonly asked questions about AUDI AZA.
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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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