The Audi BUL is a 1,984 cc, inline-four petrol engine produced between 2008 and 2013. It features naturally aspirated design with FSI (Fuel Stratified Injection), DOHC, and variable valve timing (VVT) for improved combustion efficiency. In standard tune, it delivers 103 kW (140 PS) at 6,000 rpm and 180 Nm of torque between 3,200–5,600 rpm, offering balanced performance for daily driving.
Fitted to models including the 8P A3, 8P S3 (pre-facelift), and 8P A4 Avant, the BUL engine was engineered for responsive urban and highway performance with a focus on refinement and fuel economy. Emissions compliance was achieved through a close-coupled catalytic converter and lambda control, enabling Euro 4 compliance across all production years. The engine's compact design supports transverse mounting in Audi's PQ35 platform.
One documented service concern is premature carbon buildup on intake valves, particularly in stop-start urban driving conditions. This issue, referenced in Audi Service Information Bulletin 20 08 09, stems from the absence of fuel washing over the valves in direct-injected engines. From 2010, Audi introduced revised intake manifold geometry and updated ECU mapping to mitigate deposit accumulation, though regular cleaning remains recommended.
Production years 2008–2013 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Audi BUL is a 1,984 cc inline-four petrol engine engineered for compact and mid-size platforms (2008–2013). It combines FSI direct injection with variable valve timing to deliver responsive throttle characteristics and smooth power delivery. Designed to meet Euro 4 standards, it balances everyday drivability with fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 103 kW (140 PS) @ 6,000 rpm | |
| Torque | 180 Nm @ 3,200–5,600 rpm | |
| Fuel system | Bosch Motronic ME 7.5.5 with FSI | |
| Emissions standard | Euro 4 | |
| Compression ratio | 11.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing chain (single-row) | |
| Oil type | Audi Longlife 01 (SAE 5W-40) | |
| Dry weight | 138 kg |
The FSI system enables precise fuel delivery and strong mid-range response but requires regular intake valve cleaning to prevent carbon buildup that affects idle stability and throttle response. Audi Longlife 01 (5W-40) oil is essential for hydraulic valve adjuster longevity and timing chain lubrication. Extended idling or short trips may accelerate deposit formation due to incomplete combustion cycles. The lack of turbocharging simplifies maintenance but limits tuning potential. Emissions systems rely on accurate lambda feedback; faulty sensors can trigger catalytic efficiency codes. Pre-2010 models benefit from updated ECU calibrations available via Audi TIS A32510.
Oil Specs: Requires Audi Longlife 01 (5W-40) specification (Audi SIB 20 08 09). Supersedes ACEA A3/B3 requirements.
Emissions: Euro 4 certification applies to all BUL production years (2008–2013) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output consistent across fuel qualities meeting EN 228 (Audi TIS Doc. A32605).
Audi Technical Information System (TIS): Docs A32050, A32115, A32301, SIB 20 08 09
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Audi BUL was used across Audi's 8P platform with transverse mounting and shared architecture within the Volkswagen Group. This engine received platform-specific adaptations-shorter accessory drives in the A3 and enhanced cooling in the S3-and from 2010 the facelifted A3 Mk2 adopted revised intake manifolds, creating minor service part differences. 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 A32800). The 7th digit of the VIN indicates engine family ('B' for EA113 series). Pre-2010 models feature silver valve covers with black plastic cam covers; post-2010 units use black valve covers. Critical differentiation from turbo variants: BUL has no intercooler piping and uses a naturally aspirated intake manifold. Service parts require production date verification—intake manifolds before 09/2010 are not interchangeable with post-facelift designs (Audi SIB 20 08 09).
The BUL's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban stop-start conditions. Internal Audi service reports from 2011 indicated a significant number of 8P A3 owners reporting idle instability before 80,000 km, while UK DVSA MOT records show increased emissions-related failures linked to lambda sensor degradation in high-mileage units. Short-trip driving and infrequent maintenance amplify deposit formation, making intake cleaning and oil quality adherence critical.
Analysis derived from Audi technical bulletins (2008–2013) and UK DVSA failure statistics (2014–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BUL.
Comprehensive technical documentation and regulatory references
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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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