2004 Audi A6 2.5L Diesel · BT04 RMU

Operating a 2.5-litre diesel engine from 2004 involves factoring in higher fuel consumption and road tax brackets compared to modern equivalents. Insurance falls into a typical group for large executive saloons of this era, though premiums will vary depending on driver history and postcode. Maintenance costs should be anticipated to run higher than average due to the vehicle's high mileage and potential wear on complex suspension and drivetrain components.

Budget carefully for routine consumables such as tyres, brakes, and fluid changes, along with an emergency fund for unexpected mechanical repairs. The estimated annual running cost sits around £1,800 to £2,300, covering fuel, VED tax, insurance, and typical maintenance for a high-mileage diesel vehicle.

Given that model-wide aggregate data highlights tyres, headlamps, and suspension arms as the top MOT failure reasons, inspect these areas with particular care. Check the tyre tread depth, age, and sidewall condition, ensuring even wear across all four corners. Inspect the suspension arms and bushes for play or excessive wear during a test drive or ramp inspection.

Examine the headlamp units for cloudiness or alignment issues, and test all interior and exterior lighting functions. Review the history of initial MOT failures in 2023 and 2024 to understand what prompted those refusals, even though specific defect descriptions were not recorded on those days. Confirm that the brake discs and pads have adequate thickness remaining.