If the car is still under the factory 4 year/50K you can add an "Audi" branded warranty by Fidelity from any Audi dealer. I bought my '07 A4 2.0T Quattro 6 spd. with 29K on the clock for $21K back in September. I was quoted $3400 to add 4 years and 60K miles to my A4 with a $100 deductible. For me the $1800 CPO added warranty was not attractive because it only added 2 years.