The 2.5-liter Audi BAU 2.5 TDI diesel engine was assembled by the company from 2003 to 2005 and belonged to the updated B-series, that is, the timing rockers are equipped with special rollers. This unit was most often found under the hood of such popular models as the A4 B6 and A6 C5.
|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|
|Features||2 x DOHC|
|Recommended engine oil||5W-30|
|Engine oil capacity, liter||6.0|
|Euro standards||EURO 3|
|Fuel consumption, L/100 km (for Audi A6 2004)
|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
- Most engine problems are related to failures of the electronically controlled injection pump VP44;
- There are many cases on the net when newfangled hollow camshafts burst;
- Also, this motor is extremely prone to oil leaks, especially from under the valve cover;
- At high mileage, the geometry of the turbine or the viscous coupling bearing often wedges;
- Bad oil quickly damages hydraulic lifters and pressure reducing valves.