The 2.5-liter Audi AAT 2.5 TDI diesel engine was produced by the company from 1991 to 1997 and was installed only on two models of the concern: with an index of 100 or a similar A6 in the C4 body. This five-cylinder power unit is famous for its high reliability and long service life.
The EA381 series also includes: CN, AAS, AAT, 1T, AEL, AHD, BJK.
|Fuel system||direct injection|
|Power output, hp||115|
|Torque output, Nm||265|
|Cylinder block||cast iron R5|
|Block head||aluminum 10v|
|Cylinder bore, mm||81|
|Piston stroke, mm||95.5|
|Recommended engine oil||5W-40|
|Engine oil capacity, liter||5.2|
|Euro standards||EURO 2|
|Fuel consumption, L/100 km (for Audi A6 1995)
|Engine lifespan, km||~550 000|
The engine was installed on:
- Audi 100 C4 (4A) in 1991 – 1994;
- Audi A6 C4 (4A) in 1994 – 1997.
Disadvantages of the Audi AAT engine
- One of the most reliable diesel engines of its time rarely worries its owners;
- Most of the problems are associated with malfunctions of the Bosch VE37 electronic injection pump;
- The aluminum cylinder head is afraid of overheating, it quickly leads mating surfaces;
- Replacing a timing belt with rollers is expensive, but when it breaks, the valves always bend;
- At high mileage, the turbine, mass air flow sensor and hydraulic lifters may require replacement.