Engine Audi CN

The 2.0-liter 5-cylinder Audi CN diesel engine was produced from 1978 to 1988 and was installed in the second and third generations of the rather popular Audi 100 model. This diesel engine had a supercharged DE modification, as well as an NC version with a turbine and intercooler.

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


Production years 1978-1988
Displacement, cc 1986
Fuel system prechambers
Power output, hp 69
Torque output, Nm 123
Cylinder block cast iron R5
Block head aluminum 10v
Cylinder bore, mm 76.5
Piston stroke, mm 86.4
Compression ratio 23.0
Features SOHC
Hydraulic lifters no
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 1983)
— city
— highway
— combined
Engine lifespan, km ~300 000

The engine was installed on:

  • Audi 100 C2 (43) in 1978 – 1982;
  • Audi 100 C3 (44) in 1982 – 1988.

Disadvantages of the Audi CN engine

  • This is a simple and reliable atmospheric diesel engine and all its problems from old age.
  • The most common problem is high pressure fuel pump leaks due to wear of its gaskets.
  • Monitor the condition of the timing belt, as with its breakage, the valves always bend.
  • At high mileage, these engines often experience lubricant consumption.
  • With regular overheating, the cylinder head may crack and it is not easy to find another.

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