Audi A6 2008 4.2 petrol service and maintenance

Engine oil

Engine oil capacity: 9.1 litres (9.6 quarts)
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 2008 4.2 petrol, expecting it to last until the engine is overhauled (approximately 230,000 km - 390,000 km).
Based on real life experience, the Audi A6 2008 Avant 4.2 FSI quattro 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.