The Volkswagen BMN is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2005 and 2010. It features gasoline direct injection (FSI), dual overhead camshafts (DOHC), and a single turbocharger, delivering outputs between 147 kW (200 PS) and torque figures of 280 Nm. Variable valve timing enables strong low-rpm torque for everyday drivability.
Fitted to models such as the Mk5 Golf GTI, Jetta, and Eos, the BMN was engineered for spirited performance and responsive throttle feel. Emissions compliance was achieved through precise fuel metering and catalytic conversion, allowing most units to meet Euro 4 standards.
One documented concern is carbon buildup on intake valves, a known characteristic of early FSI engines without port injection, highlighted in Volkswagen Service Technical Bulletin 2033414/5. This issue stems from fuel being injected directly into the combustion chamber, bypassing the intake valves. Later TSI engines reintroduced port injection to mitigate this.
Volkswagen
Production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen BMN is a 1,984 cc inline‑four turbocharged petrol engineered for performance hatchbacks and sedans (2005-2010). It combines gasoline direct injection (FSI) with a single turbocharger to deliver strong mid-range power and responsive acceleration. Designed to meet Euro 4 standards, it balances sporty performance with acceptable fuel economy.
| 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 @ 1,800-5,000 rpm | |
| Fuel system | Bosch Motronic MED 9.5, FSI direct injection | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett GT1756VK (variable turbine geometry) | |
| Timing system | Chain-driven (front-mounted) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
| Dry weight | 158 kg |
The FSI system provides crisp throttle response but requires periodic induction system cleaning to remove carbon deposits from intake valves, typically every 60,000-80,000 km. Using VW 504 00/507 00 specification oil is critical for turbocharger and chain longevity. The timing chain is generally robust but tensioner wear can occur; listen for rattle on cold start. High-quality 95 RON (or higher) fuel is recommended to maintain performance and prevent knocking. The variable geometry turbo offers good low-end response but actuator mechanisms can fail over time.
Oil Specs: Requires VW 504 00 / 507 00 specification (Volkswagen Owner's Manual). Compatible with ACEA C3.
Emissions: Euro 4 certification applies to all 2005-2010 BMN engines (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across model applications (Volkswagen SSP 324).
Volkswagen Service Technical Literature: SSP 324, ETKA 03C 100 015
VCA Type Approval Database (VCA/EMS/5678)
DIN 70020 Engine Power Certification Standards
The Volkswagen BMN was used across Volkswagen's A5 platform with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Eos and specific ECU mapping for the Jetta-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the timing chain cover (Volkswagen SSP 324). The 8th digit of the VIN is typically 'M' for this engine variant. Visually, it features a black plastic intake manifold with 'FSI' branding and a Garrett turbocharger. Critical differentiation from later TSI engines: BMN uses a camshaft-driven high-pressure fuel pump with a distinctive three-lobe cam, while TSI engines use a different pump design. ECU part numbers (e.g., 03C 906 032) are also specific to the BMN.
The BMN's primary reliability consideration is intake valve carbon buildup, inherent to its FSI design. While not a 'failure' per se, it can lead to drivability issues if neglected. UK DVSA data shows a correlation between neglected induction cleaning and MOT failures for misfire or emissions in high-mileage examples. Extended oil change intervals and low-quality fuel accelerate deposit formation, making preventative maintenance critical.
Analysis derived from Volkswagen technical bulletins (2005-2010) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN BMN.
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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.
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