Engine Audi AAR

The 2.3-liter Audi AAR engine was assembled at the factories of the German concern from 1990 to 1996 and was installed on the model under the index 100 in C3 – C4 bodies and the very first generation A6.

The EA828 series includes: RT, KU, NF, NG, AAR, AAN.


Production years 1990-1996
Displacement, cc 2309
Fuel system KE-III-Jetronic
Power output, hp 133
Torque output, Nm 186
Cylinder block cast iron R5
Block head aluminum 10v
Cylinder bore, mm 82.5
Piston stroke, mm 86.4
Compression ratio 10.0
Features SOHC
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 4.5
Fuel type petrol
Euro standards EURO 2
Fuel consumption, L/100 km (for Audi A6 1995)
— city
— highway
— combined
Engine lifespan, km ~350 000

The engine was installed on:

  • Audi 100 C3 (44) in 1990 – 1991; 100 C4 (4A) in 1990 – 1994;
  • Audi A6 C4 (4A) in 1994 – 1996.

Disadvantages of the Audi AAR engine

  • The main engine problems are related to the vagaries of the KE-III-Jetronic injection system;
  • The cause of unstable engine operation is usually air leakage or contamination of the idle valve;
  • The fuel pump lasts for a relatively short time and the nozzles clog rather quickly;
  • Ignition system components often fail: slider or distributor cover;
  • At high mileage, hydraulic lifters often wear out and begin to knock.

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