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,…
Production years 1995–2000 meet Euro 2 standards .
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 178 kg |
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.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
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 AYS is a robust engine when properly maintained, but pre-1997 models are prone to hydraulic lifter failure. Later revisions with the updated lifters (Part No. 078 109 417C) show improved reliability. Regular oil changes and strict adherence to the 90,000 km timing belt interval are essential for longevity. Well-maintained examples can exceed 200,000 km.
Key issues include hydraulic valve lifter wear (leading to ticking noise), intake valve carbon buildup, coolant leaks from the thermostat housing, and ignition coil pack failure. These are documented in Audi service bulletins and field reports. Preventive maintenance significantly reduces risk of major failures.
The AYS engine was used in the Audi A4 (B5) 2.8 SE/Quattro (1995–2000) and Audi A6 (C4) 2.8 E (1995–1997). It was not used in later C5 platform models, which adopted the newer 30V engines with different engine codes. No cross-brand applications outside Volkswagen Group V6 derivatives.
Limited tuning potential exists. ECU remapping is rare due to MOTRONIC ME7.1 constraints, but intake and exhaust upgrades can yield modest gains. Camshaft upgrades improve high-RPM performance but reduce low-end torque. Forced induction is highly complex due to engine architecture. Most owners prioritize reliability over modifications.
Moderate for its era. The Audi A4 2.8 SE averages ~11.8 L/100km (city) and ~7.5 L/100km (highway), or approximately 24 mpg UK combined. Real-world consumption depends on driving style and condition. Expect 20–25 mpg (UK) in mixed driving for a well-maintained AYS-powered vehicle.
Yes. The AYS is an interference engine. If the timing belt fails or jumps, pistons will contact open valves, causing severe internal damage. This makes timely belt replacement with OEM-quality parts absolutely critical. Any signs of tensioner noise should be investigated immediately.
Audi specifies SAE 10W-40 mineral or semi-synthetic oil meeting API SJ/CD standards. Use of modern low-SAPS oils is not recommended. Oil should be changed every 15,000 km or annually to protect camshafts and lifters. Proper oil selection is vital for longevity in this high-RPM V6.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.