Engine Audi BHT

The 6.0-liter 12-cylinder Audi BHT A8 W12 engine was produced from 2003 to 2010 and was installed on expensive trim levels of the A8 sedan in the back of the D3, including the extended version of the A8L. Other modifications of this motor under the BTE and BSB indices were also installed on this model.

The EA398 series includes: BHT, BRN, CEJA, BDN.


Production years 2003-2010
Displacement, cc 5998
Fuel system distributed injection
Power output, hp 450
Torque output, Nm 580
Cylinder block aluminum W12
Block head aluminum 48v
Cylinder bore, mm 84
Piston stroke, mm 90.3
Compression ratio 10.75
Features no
Hydraulic lifters yes
Timing drive chain
Phase regulator on all shafts
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 12.5
Fuel type petrol
Euro standards EURO 4
Fuel consumption, L/100 km (for Audi A8L 2005)
— city
— highway
— combined
Engine lifespan, km ~240 000

The engine was installed on:

  • Audi A8 D3 (4E) in 2003 – 2010.

Disadvantages of the Audi BHT engine

  • Closely monitor the cooling system, this motor is very afraid of overheating;
  • Frequent overheating and low-quality oil lead to the formation of scoring in the cylinders;
  • Raised cylinders begin to knock and immediately there is a large oil consumption;
  • If you miss the drop in oil pressure, it will turn the liners pretty quickly;
  • The timing chain drive has a limited resource, and for replacement you need to remove the engine.

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