1900 huh, sounds quite the work... Audis are expensive to maintain and repair, when the sh*t hits the fan it can get expensive, and you just got the car so it kind of sucks, but it does need to get fixed. Like you said take it to a reputable mechanic that knows how to work on Audi.

 

That 'orange sealer' is 'The Right Stuff' from Permatex.. the best make-your-own there is and better than the OEM rubber.

That power steering fluid will ruin your control arm bushings, which is prolly why your mechanic suggests a change out. Dont let the dealer tell you otherwise.