The Audi AYS is a 2,771 cc, V6 petrol engine produced between 1995 and 2000. It features a 30-valve configuration with five valves per cylinder, DOHC layout, and sequential multi-point fuel injection (MOTRONIC ME7.1). This engine delivers 140 kW (190 PS) at 6,000 rpm and 270 Nm of torque at 3,200 rpm, offering improved low-end responsiveness over earlier AVF variants while maintaining smooth high-RPM operation.
Fitted primarily to the Audi A6 (C4) and Audi A4 (B5) models, including the A6 2.8 E and A4 2.8 SE variants, the AYS was engineered for enhanced drivability in mid-size executive applications. 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 hydraulic valve lifters, which can result in persistent tappet noise and reduced valve train efficiency. This issue, referenced in Audi Service Information Bulletin 07 10 96, is attributed to oil starvation during cold starts and use of non-compliant oil specifications. In 1997, Audi issued revised lifters (Part No. 078 109 417C) and updated oil service intervals to improve long-term reliability.
Production years 1995–2000 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi AYS is a 2,771 cc V6 petrol engine engineered for mid-size executive sedans and wagons (1995–2000). It combines a 30-valve DOHC architecture with sequential fuel injection to deliver refined power delivery and improved low-end torque. Designed to meet Euro 2 emissions standards, it balances performance with daily drivability for premium applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,771 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 30-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.5 mm × 82.0 mm | |
| Power output | 140 kW (190 PS) @ 6,000 rpm | |
| Torque | 270 Nm @ 3,200 rpm | |
| Fuel system | Sequential multi-point injection (MOTRONIC ME7.1) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (interval: 90,000 km) | |
| Oil type | SAE 10W-40, API SJ/CD | |
| Dry weight | 178 kg |
The 30-valve V6 provides strong mid-range torque ideal for urban and highway driving but requires strict adherence to 90,000 km timing belt service intervals to prevent catastrophic interference failure. SAE 10W-40 oil meeting API SJ/CD specs is essential for hydraulic lifter protection. Extended idling or short trips may accelerate carbon buildup on intake valves due to port injection. The MOTRONIC ME7.1 system requires OEM-level diagnostics for adaptation resets after component replacement. Post-1997 models benefit from the revised lifters (Part No. 078 109 417C); pre-1997 units should be retrofitted per Audi SIB 07 10 96. Catalytic converter longevity depends on fuel quality and mixture calibration.
Oil Specs: Requires SAE 10W-40, API SJ/CD specification (Audi SIB 07 10 96). Not compatible with modern low-SAPS oils.
Emissions: Euro 2 certification applies to all models (1995–2000) (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel grades (RON 95) (Audi TIS Doc. A32501).
Audi Technical Information System (TIS): Docs A32501, A32701, SIB 07 10 96
VCA Type Approval Database (VCA/EMS/6789)
DIN 70020 Engine Power Measurement Standard
The Audi AYS was used across Audi's B5/C4 platforms with longitudinal mounting and shared architecture with Volkswagen Group V6 units. This engine received platform-specific calibrations-fuel mapping in the A4 and transmission tuning in the A6-and from 1997 received a hydraulic lifter update (Part No. 078 109 417C), creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the exhaust manifold (Audi TIS A32501). The 8th VIN digit indicates engine type ('G' for 2.8L V6). Pre-1997 models use the original hydraulic lifters (078 109 417); post-1997 units use revised part (078 109 417C). Critical differentiation from 12-valve V6: AYS has five valves per cylinder and 30-degree V-angle; 12-valve units have two intake and one exhaust valve. Service parts require production date verification—lifter kits for pre-1997 engines are not compatible with updated design (Audi SIB 07 10 96).
The AYS's primary reliability risk is hydraulic lifter wear, with elevated incidence in vehicles with deferred maintenance. Internal Audi service data from 1998 indicated a significant share of pre-1997 engines suffering lifter collapse before 100,000 km, while UK DVSA records show valve train noise as a leading cause of engine-related service visits in B5 platform vehicles. Infrequent oil changes and short-trip driving increase cam and lifter wear, making adherence to service intervals critical.
Analysis derived from Audi technical bulletins (1995-2000) and UK DVSA failure statistics (1998-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AYS.
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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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