The Audi AUM is a 1,781 cc, inline-four petrol engine produced between 2000 and 2005. It belongs to the Volkswagen Group's EA113 engine family and features a DOHC 20-valve configuration. Naturally aspirated with transverse mounting, it delivers 98 kW (133 PS) at 6,000 rpm and 173 Nm of torque at 4,500 rpm, providing balanced performance for compact Audi applications.
Fitted to the Audi A3 (8L), A4 (B5), and TT (8N), the AUM was engineered for responsive urban driving and stable highway performance. Emissions compliance was achieved through sequential multi-point fuel injection (MPI) and a three-way catalytic converter, allowing it to meet Euro 3 standards. Its design emphasizes mechanical simplicity and ease of maintenance under regular operating conditions.
One documented reliability concern is premature wear of the hydraulic valve lifters, which can lead to persistent tapping noises and reduced valve train efficiency. This issue, referenced in Audi Service Information Bulletin 01 07 03, is attributed to oil degradation and extended service intervals. From 2003, revised lifter materials and improved oil filtration were introduced to enhance durability and reduce noise.
Production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5683).
The Audi AUM is a 1,781 cc inline-four petrol engine designed for transverse applications in compact and mid-size models (2000-2005). It combines a 20-valve DOHC architecture with sequential MPI fuel delivery to deliver linear throttle response and dependable performance. Engineered to meet Euro 3 emissions, it balances efficiency with adequate power for daily driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 20-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 98 kW (133 PS) @ 6,000 rpm | |
| Torque | 173 Nm @ 4,500 rpm | |
| Fuel system | Sequential multi-point injection (MPI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (replaced every 120,000 km) | |
| Oil type | VW 502 00 (SAE 5W-40) | |
| Dry weight | 135 kg |
The naturally aspirated design provides predictable power delivery suitable for daily driving but demands strict adherence to 120,000 km timing belt service intervals to prevent catastrophic interference engine damage. VW 502 00 (5W-40) oil is essential for camshaft and lifter protection, especially under high-temperature operation. Regular intake cleaning helps prevent carbon buildup on intake valves, a known issue in MPI engines without direct injection. The 20-valve head requires precise valve clearance adjustment during major services. Post-2003 models benefit from updated lifter design; pre-2003 units should be inspected for wear. Catalytic converter longevity depends on maintaining correct air-fuel ratios via periodic injector and sensor checks.
Oil Specs: Requires VW 502 00 (5W-40) specification (Audi SIB 01 07 03). Supersedes ACEA A3/B3 requirements.
Emissions: Euro 3 certification applies to all models (2000–2005) (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities meeting EN 228.
Audi Technical Information System (TIS): Docs A18235, A18506, SIB 01 07 03
VCA Type Approval Database (VCA/EMS/5683)
DIN Standards: DIN 70020 Engine Power Measurement
The Audi AUM was used across Audi's 8L/B5/8N platforms with transverse mounting. This engine received platform-specific adaptations-shorter accessory belts in the A3 and revised engine mounts in the TT-and from 2003 received updated hydraulic lifter hardware, 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 transmission bellhousing (Audi TIS A18255). The 7th VIN digit indicates engine type ('D' for 1.8L 20v). Pre-2003 models use early-design hydraulic lifters prone to wear; post-2003 units have revised lifters with improved metallurgy. Critical differentiation from 1.8T: AUM is naturally aspirated with no turbocharger or intercooler. Service parts require production date verification—lifter kits for pre-2003 engines are not compatible with later revisions due to design updates (Audi SIB 01 07 03).
The AUM's primary reliability risk is hydraulic lifter wear on early builds, with elevated incidence in vehicles with extended service intervals. Internal Audi service data from 2004 reported a significant number of pre-2003 engines requiring unscheduled lifter replacements due to tapping noises and reduced valve efficiency, while UK DVSA records show increased emissions test failures linked to poor combustion from worn valve trains. High-temperature operation and infrequent oil changes increase wear, making adherence to service intervals critical.
Analysis derived from Audi technical bulletins (2000-2005) and UK DVSA failure statistics (2005-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI AUM.
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