My C5 has only 11K on it, but I still bought an extended warranty after checking to make sure my local Audi dealer would honour it (I bought the Beast from a 3rd party dealer). Although I have very little Km on the car, I don't want to risk an unexpected "one-off" disaster given the $$ of any significant repairs for this car. Like Palette I also went with Global Warranty (went for the Ultimate Drive for 4 years); they seem to have a pretty comprehensive list of stuff that they cover and they have an A+ with the BBB. Some 3rd parties specifically do NOT cover the RS6, including the 3rd party one initially recommended by my local Audi dealer (!). So do read the fine print.