Engine Audi AFB

The 2.5-liter Audi AFB 2.5 TDI diesel engine was assembled by the company from 1997 to 1999 and installed on such popular models as the A4 B5, A6 C5, A8 D2 and Volkswagen Passat B5. After upgrading to more modern environmental standards EURO 3, the diesel engine changed its index to AKN.

The EA330 series also includes: AFB, AKE, AKN, AYM, BAU, BDG, BDH.


Production years 1997-1999
Displacement, cc 2496
Fuel system direct injection
Power output, hp 150
Torque output, Nm 310
Cylinder block cast iron V6
Block head aluminum 24v
Cylinder bore, mm 78.3
Piston stroke, mm 86.4
Compression ratio 19.5
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 2
Fuel consumption, L/100 km (for Audi A6 C5 1998)
— city
— highway
— combined
Engine lifespan, km ~250 000

The engine was installed on:

  • Audi A4 B5 (8D) in 1997 – 1999;
  • Audi A6 C5 (4B) in 1997 – 1999;
  • Audi A8 D2 (4D) in 1997 – 1999;
  • Volkswagen Passat B5 (3B) in 1998 – 1999.

Disadvantages of the Audi AFB engine

  • The most famous problem is the rapid wear of the camshaft cams and rockers;
  • In second place there are failures in the operation of the Bosch VP44 electronically controlled high-pressure fuel pump;
  • The crankcase ventilation filter clogs quickly and needs to be cleaned constantly;
  • The outdated film-type MAF is distinguished by low reliability in the engine;
  • The motor is prone to oil leaks at the joints of the block with the sump and from under the valve cover.

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