Audi A6 2004 2.7 diesel service and maintenance

Engine oil

Engine oil capacity: 8.2 litres (8.7 quarts)
Oil change interval is 15,000 km or one year, whichever comes first.
Recommended oil type (Oil Viscosity Classification SAE) is 5W-30

Timing chain

There is no manufacturer specified replacement interval for the engine timing chain on Audi A6 2004 2.7 diesel, expecting it to last until the engine is overhauled (approximately 310,000 km - 520,000 km).
Based on real life experience, the Audi A6 2004 2.7 TDI timing chain change interval is approximately 200,000 km as at this mileage it may become overstretched and require replacement, so it is recommended to check the condition of the chain periodically after this mileage is reached and replace the timing chain if it becomes excessively stretched or if unusual engine noises occur.

Engine coolant

Engine coolant (antifreeze) recommended replacement interval for Audi A6 2.7 diesel is 75,000 km or 5 years, whichever comes first.

Gearbox oil change

Audi A6 automatic transmission oil change interval is 60,000 km.