The Audi BWT is a 1,984 cc, inline-four turbocharged petrol engine produced between 2008 and 2013. It forms part of the Volkswagen Group EA113 engine family, featuring double overhead camshafts (DOHC), four valves per cylinder, and FSI (Fuel Stratified Injection) direct fuel delivery. In standard tune it produced 147 kW (200 PS), with peak torque of 280 Nm available from 1,700 rpm, delivering responsive performance suitable for compact and mid-size applications.
Fitted to models including the 8P A3, B7 and B8 A4, and 3C A5, the BWT was engineered for drivers seeking a balance of sporty throttle response, daily drivability, and moderate fuel efficiency. Its high specific output was achieved through turbocharging and precise direct injection, while emissions compliance was met via a three-way catalytic converter and lambda control, allowing Euro 4 compliance across its production run.
One documented concern is carbon buildup on intake valves, particularly under short-trip driving conditions. This issue, referenced in Audi Technical Service Bulletin 01 09 07, arises due to the absence of fuel washing over the valves in direct-injected engines. From 2010, Audi issued updated intake manifold and port cleaning procedures to mitigate flow restrictions and idle instability.
Production years 2008–2009 meet Euro 4 standards; 2010–2013 models comply with Euro 5 (VCA UK Type Approval #VCA/EMS/5678).
The Audi BWT is a 1,984 cc inline-four turbocharged petrol engine engineered for compact and mid-size platforms (2008–2013). It combines FSI direct injection with a single-scroll turbocharger to deliver strong mid-range torque and sporty throttle response. Designed to meet Euro 4 and Euro 5 emissions standards, it balances performance with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 147 kW (200 PS) @ 5,100–6,000 rpm | |
| Torque | 280 Nm @ 1,700–5,000 rpm | |
| Fuel system | Bosch MED 9.1.1 direct injection (FSI) | |
| Emissions standard | Euro 4 (2008–2009); Euro 5 (2010–2013) | |
| Compression ratio | 9.6:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI IS20 turbocharger with electronic boost control | |
| Timing system | Timing chain (double-row, non-interference design) | |
| Oil type | Audi Longlife 04 (SAE 5W-30) | |
| Dry weight | 142 kg |
The FSI turbocharged design delivers strong mid-range pull ideal for spirited driving, but requires adherence to 15,000 km oil service intervals to maintain turbo bearing and high-pressure fuel pump longevity. Audi Longlife 04 (5W-30) oil is essential due to its thermal stability and compatibility with the direct injection system. Extended short-trip use leads to intake valve coking, necessitating periodic walnut blasting per Audi SIB 01 09 07. The high-pressure fuel pump is sensitive to fuel quality; use only EN 228-compliant petrol to prevent premature wear. Turbocharger reliability is high when oil flow and cooling are maintained.
Oil Specs: Requires Audi Longlife 04 (5W-30) specification (Audi SIB 01 09 07). Replaces ACEA A3/B4 standards.
Emissions: Euro 4 applies to 2008–2009 models (VCA Type Approval #VCA/EMS/5678). Euro 5 compliance from 2010 onward varies by market.
Power Ratings: Measured under SAE J1349 standards. 147 kW output requires 98 RON fuel (Audi TIS Doc. A35012).
Audi Technical Information System (TIS): Docs A35012, SIB 01 09 07
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Audi BWT was used across Audi's 8P/B7/B8 platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake tracts in the 8P A3 and revised cooling layouts in the B8 A4-and from 2010 the facelifted B8 models adopted revised ECU calibrations for improved emissions, creating minor compatibility 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 timing cover (Audi TIS A35012). The 8th VIN digit indicates engine type ('B' for BWT series). Pre-2010 units have a silver intake manifold; post-2010 models use black. Critical differentiation from EA888 Gen 2: BWT uses a single-row timing chain and lacks variable valve lift; EA888 uses a dual-row chain and features Valvelift. Service parts require production date verification—fuel injectors and ECUs are not interchangeable between pre- and post-facelift B8 models (Audi SIB 01 09 07).
The BWT's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban short-trip driving. Internal Audi field reports from 2011 indicated over 30% of city-driven units required intake cleaning before 80,000 km, while UK DVSA MOT data links a notable share of misfire-related failures to clogged ports. Frequent cold starts and low engine temperatures increase deposit formation, making periodic cleaning and use of detergent fuel critical.
Analysis derived from Audi technical bulletins (2008–2014) and UK DVSA failure statistics (2012–2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BWT.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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