Engine Oil and Fluid Recommendation for Audi A6, S6, SR6 (4A, C4; 4B2, C5) – A6 2.5 TDI, -quattro Motor oils are an important component of a car engine. With the right choice of chemical, mechanical, thermal qualities, engine oils are able to provide stable, reliable and long-term engine operation throughout the life of the car.
  • Engine oil capacity, liter: 5.3-5.5
  • Manual transmission capacity, liter: 2.4-2.7
  • Automatic transmission capacity, liter: 9.0
  • Differential capacity, liter: 0.8/1.3/1.5
  • Power steering capacity, liter: 0.9
  • Cooling system capacity, liter: 10.0
  • Year: 1997-05

Engine oil

  • Synthetic oil: Longlife III 5W-30 (Longlife 3 5W-30)

Manual transmission

  • Synthetic gear oil: 75W90 GL5

Differential

  • Synthetic gear oil: 75W90 GL5

Power steering

  • Hydraulic fluid: CHF/Central Hydraulic Fluid

Cooling system

  • Antifreeze for the engine: Antifreeze G12 red