The Passat B5 and Audi models like the A6 C5 and the convertible based on the A4 B6 were equipped with the 2.5-liter diesel Volkswagen BDH 2.5 TDI, which was manufactured between 2004 and 2006. In essence, this power unit is an upgraded EURO 4 version of the well-known BAU engine.
AFB, AKE, AKN, AYM, BAU, BDG, and BDH are additional models in the EA330 series.
Specifications
| Production years | 2004-2006 |
| Displacement, cc | 2496 |
| Fuel system | direct injection |
| Power output, hp | 180 |
| Torque output, Nm | 370 |
| Cylinder block | cast iron V6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 78.3 |
| Piston stroke, mm | 86.4 |
| Compression ratio | 18.5 |
| Features | 2 x DOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | VGT |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 6.0 |
| Fuel type | diesel |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Volkswagen Passat 4WD 2005) — city — highway — combined |
10.6 5.9 7.6 |
| Engine lifespan, km | ~320 000 |
The engine was installed on:
- Audi A4 B6 Cabrio in 2004 – 2006;
- Audi A6 C5 (4B) in 2004 – 2005;
- Volkswagen Passat B5 (3B) in 2004 – 2005.
Disadvantages of the VW BDH engine
The erratic VP44 injection pump is the main source of owners’ issues;
Modern hollow camshafts frequently burst after 150–250 thousand kilometers;
Additionally, the turbine’s geometry mechanism frequently wedges, the viscous coupling bearing is short-lived, and low-quality oils can cause hydraulic lifters and pressure-reducing valves to seize. Grease also continuously seeps from the motor’s joints and beneath the valve covers.