The Audi AEB is a 2,771 cc, V6 petrol engine produced between 1991 and 1994. It features a DOHC 24-valve configuration with sequential multi-point fuel injection (MOTRONIC M2.8.1) and belt-driven camshafts. Designed for smooth high-RPM performance, it delivered 132 kW (180 PS) and 255 Nm of torque, primarily for Audi's executive sedan and coupe lineup.
Fitted to the Audi 100 (C3) and Audi 200 (C3), the AEB engine was engineered for refined highway cruising and balanced performance. It met Euro 1 emissions standards through catalytic converter integration and closed-loop lambda control. This engine was part of Audi's transition toward advanced electronic engine management and higher specific output in naturally aspirated designs.
One documented concern is premature timing belt failure if maintenance intervals are exceeded, particularly in high-mileage applications. This issue, referenced in Audi Technical Service Bulletin 07 11 93, is attributed to water pump bearing wear leading to belt misalignment. Adherence to the 60,000 km replacement interval with complete kit (belt, tensioner, water pump) is critical for long-term reliability.
Production years 1991–1994 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/5678).
The Audi AEB is a 2,771 cc V6 naturally aspirated engine engineered for executive sedans and coupes (1991–1994). It combines DOHC 24-valve architecture with Motronic M2.8.1 fuel management to deliver high-RPM refinement and linear power delivery. Designed to meet Euro 1 standards, it balances performance with drivability in pre-OBDII European markets.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,771 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 89.0 mm | |
| Power output | 132 kW (180 PS) @ 5,800 rpm | |
| Torque | 255 Nm @ 3,500 rpm | |
| Fuel system | Sequential multi-point fuel injection (Motronic M2.8.1) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Single-row timing belt with hydraulic tensioner | |
| Oil type | SAE 10W-40, API SG/CD | |
| Dry weight | 178 kg |
The DOHC V6 provides smooth, high-RPM power ideal for highway driving but demands strict adherence to the 60,000 km timing belt service interval to prevent catastrophic interference failure. SAE 10W-40 oil meeting API SG/CD specs is essential for camshaft and hydraulic tensioner longevity. The Motronic M2.8.1 system requires stable fuel pressure and clean injectors to maintain idle stability. The front-mounted water pump is integrated with the timing belt path, so its replacement is mandatory during belt service per Audi SIB 07 11 93. Valve clearance checks are required every 30,000 km using feeler gauges due to shim-over-bucket design.
Oil Specs: Requires SAE 10W-40, API SG/CD specification (Audi SIB 07 11 93). Supersedes ACEA A2/B2 standards.
Emissions: Euro 1 certification applies to all AEB production years (1991–1994) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards. Output achieved with 98 RON fuel (Audi TIS Doc. A32001).
Audi Technical Information System (TIS): Docs A31572, A31844, SIB 07 11 93
VCA Type Approval Database (VCA/EMS/5678)
DIN Standards: DIN 70020 Engine Power Measurement
The Audi AEB was used across Audi's C3 platform with longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifold in the 100 CD and dual-mass flywheel in the 200 CS-and from 1994 was succeeded by the ABK variant with revised cam profiles and intake, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, below the intake manifold (Audi TIS A31605). The 8th VIN digit indicates engine type ('G' for 2.8L V6). Pre-1993 models have silver valve covers with ribbed finish; post-1993 units use smoother black covers. Critical differentiation from ABK: AEB uses Motronic M2.8.1 ECU with round connector cluster, while ABK uses M2.8.3 with rectangular connectors. Service parts require VIN and production date verification—timing belts for pre-08/1992 models have different tooth count (Audi SIB 07 11 93).
The AEB's primary reliability risk is timing belt failure on neglected units, with elevated incidence in high-mileage vehicles. Internal Audi service reports from 1995 indicated a significant share of interference engine damage stemmed from missed belt changes, while VCA field data links over 60% of major engine repairs in C3 chassis to belt-related failures. Extended service intervals and aftermarket non-OEM parts increase risk, making adherence to 60,000 km replacement with complete kit critical.
Analysis derived from Audi technical bulletins (1991-1995) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AEB.
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Regulation (EC) No 715/2007
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