The company assembled the 2.5-liter Audi BAU 2.5 TDI diesel engine between 2003 and 2005. It was a part of the updated B-series, which has timing rockers with unique rollers. This unit was most frequently located under the hood of well-known models like the A6 C5 and A4 B6.
The EA330 series also includes: AFB, AKE, AKN, AYM, BAU, BDG, BDH.
Specifications
| Production years | 2003-2005 |
| 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 3 |
| Fuel consumption, L/100 km (for Audi A6 2004) — city — highway — combined |
11.3 6.2 8.1 |
| Engine lifespan, km | ~300 000 |
The engine was installed on:
- Audi A4 B6 (8E) in 2003 – 2004;
- Audi A6 C5 (4B) in 2003 – 2005;
- Volkswagen Passat B5 (3B) in 2003 – 2005.
Disadvantages of the Audi BAU engine
The majority of engine issues are caused by the electronically controlled injection pump VP44 failing;
The geometry of the turbine or the viscous coupling bearing frequently wedges at high mileage; bad oil rapidly damages hydraulic lifters and pressure-reducing valves; there are numerous examples of newfangled hollow camshafts bursting on the internet; and this motor is very vulnerable to oil leaks, particularly from under the valve cover.