Woe is me. $17,500 for a repair!
 

First of all, beware of Clarkdale Audi in Vancouver. They love to argue and tell you that your car is okay.

My car has suffered enough damage to the engine that the repairs are almost 18 thousand dollars! I bought my Audi S4 in January. Read this...

http://www.audiforums.com/m_302730/tm.htm

That really sucks man. I would write a letter to Audi of Canada explaining in detail what happened and who was responsible for the damage to the engine by avoiding to fix it. Also if the car was in an accident and they never told you I'm sure there's some kinda law stating that they have to tell you.