Audi S8 D5

Biturbo V8 with 420 kW and 48V mild hybrid in the S8 D5. Flagship engine with cylinder deactivation and enormous power delivery. Luxury and performance combined.

• !! Oil Strainer Clogging Leads to Turbocharger Damage from 120,000 km

  The oil strainer inside the engine clogs and cuts off the turbocharger lubricating oil supply. Vehicles fail without warning. In the US, 58 official complaints were registered.

  Symptoms: Sudden engine shutdown without warning, power reduction, turbo noises
  3,000–15,000 $
  Ad Ölsieb 4.0 TFSIoil filter V8 BiTurboturbocharger 4.0 TFSI
• !! Charge Air Hoses Leaking from 80,000 km

  The high boost pressures of the BiTurbo configuration heavily stress charge air hoses and seals. Leaks cause power loss up to limp mode.

  Symptoms: Power dip, engine stumbling under load, noticeable limp mode, whistling noises from the engine bay
  200–800 $
  Ad Ladeluftschlauch 4.0 TFSIintercooler gasket V8 BiTurbo
• !! High-Pressure Pump Wear from 130,000 km

  Hitachi high-pressure pumps wear on the tappet rods. Improved tappet rods were introduced as a replacement part. A pump failure manifests as starting problems and rough running.

  Symptoms: Difficult starting, rough engine running, power loss especially at higher rpm
  800–1,800 $
  Ad high-pressure fuel pump 4.0 TFSIhigh-pressure fuel pump V8 BiTurbo

+ 6 more engine weaknesses + vehicle weaknesses