Engine Audi AAS

The 2.4-liter 5-cylinder Audi AAS diesel engine was produced from 1991 to 1994 and was installed only on the fourth generation of the popular Audi 100 model. This unit is an updated version of the 3D diesel engine known from the C3 model.

The EA381 series also includes: CN, AAS, AAT, 1T, AEL, AHD, BJK, BJM.


Production years 1991-1994
Displacement, cc 2370
Fuel system prechambers
Power output, hp 82
Torque output, Nm 164
Cylinder block cast iron R5
Block head aluminum 10v
Cylinder bore, mm 79.5
Piston stroke, mm 95.5
Compression ratio 23.0
Features SOHC
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 5.0
Fuel type diesel
Euro standards EURO 1
Fuel consumption, L/100 km (for Audi 100 1993)
— city
— highway
— combined
Engine lifespan, km ~380 000

The engine was installed on:

  • Audi 100 C4 (4A) in 1991 – 1994.

Disadvantages of the Audi AAS engine

  • This is a very reliable and durable diesel engine without a turbine and with a mechanical injection pump;
  • The only weak point of the motor is the cylinder head prone to cracking;
  • You also need to monitor the condition of the timing belt, since when it breaks, the valves bend;
  • After 200,000 km, lubricant consumption is common, up to a liter per 1000 km;
  • Even on long runs, the high-pressure fuel pump often leaks here due to the wear of its gaskets.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top