The 2005 Audi A6 C6 3.0 TDI Quattro was equipped with a V6 turbocharged diesel engine.
The engine produced 204 horsepower and 369 lb-ft of torque.
The car's top speed was electronically limited to 155 mph (250 km/h).
It had a 5-speed Tiptronic automatic transmission and a 6-speed manual transmission as an option.
Quattro all-wheel drive system with a self-locking center differential and a rear electronic differential.
The engine featured a common rail fuel injection system and a variable vane turbocharger.
The car had a 0-60 mph (97 km/h) time of around 8 seconds.
The Audi A6 C6 3.0 TDI Quattro had a combined fuel economy rating of up to 37 mpg (12.9 km/l).
It featured a Driver Information System with an onboard computer and a trip computer.
The car's infotainment system included a CD player, radio, and a cassette tape player as standard.
An optional Bose surround sound system was available on higher trim levels.
The A6 C6 3.0 TDI Quattro had an adaptive air suspension system with three modes: comfort, normal, and sport.
It featured 16-inch alloy wheels as standard, while 17-inch wheels were available as an option.
The car's brake system included ventilated front disc brakes and solid rear disc brakes.
Audi A6 C6 3.0 TDI Quattro had a 2-stage ESP (Electronic Stability Program) with a traction control system.
It featured 8 airbags, including dual frontal, side, and curtain airbags as standard.
The car's body was made from aluminum and steel for improved strength-to-weight ratio.
A 'winter mode' was available on the adaptive cruise control system, which altered the engine's power delivery and transmission settings.
It had a parking system with ultrasonic sensors and a rearview camera as an option.
The car's interior featured premium leather upholstery as standard.
Optional features included a memory package for the driver's seat and steering wheel.
Audi A6 C6 3.0 TDI Quattro was equipped with a panoramic glass sunroof.
It had dual-zone climate control system for separate heating and cooling settings.
The car's engine management system included an 'overboost' function, which allowed the turbocharger to produce temporary extra boost pressure.
A driver information package that displayed essential information such as speed, distance traveled, and fuel consumption was available on higher trim levels.
Optional features included a 6CD changer with a memory function for up to six CDs.
The car's adaptive cruise control system could be programmed with the driver's preferences for speed and following distance.
Audi A6 C6 3.0 TDI Quattro had an integrated navigation system that displayed real-time traffic updates and points of interest.
It featured a manual transmission shift indicator, which reminded the driver to shift gears at optimal times for improved fuel efficiency.
The car's electronic stability control system included a warning light on the dashboard if it detected wheel slip or loss of traction.
A manual override function was available on the electronic throttle control system, allowing the driver to take control of engine power delivery in emergency situations.
Audi A6 C6 3.0 TDI Quattro had an anti-theft alarm system with a parking reminder function that checked the fuel level and battery condition when parked for extended periods.
The car's headlight washer nozzles were designed to clean the headlights while driving through water or snow.
It featured a rain sensor with automatic windscreen wiper activation.
Audi A6 C6 3.0 TDI Quattro had an advanced automatic air conditioning system that adjusted cooling settings based on outside temperature and humidity levels.
The car's rear seats could be folded flat to create additional cargo space.
It featured a cargo net for securing loose items in the boot.
Audi A6 C6 3.0 TDI Quattro had an optional 'S-line' exterior package that added distinctive styling elements and sporty details.
The car's interior trim was available in various wood finishes, including walnut and rosewood.
Audi A6 C6 3.0 TDI Quattro was produced with a limited-edition 'quattro prestige' model that featured unique styling elements and upgraded equipment levels.