Just purchased a 2012 a6 c7 Quatro. I need to have the water pump replaced. Labor is $450. My question, I would like to have everything that could go wrong replaced while the mechanic has the water pump out and what is out etc. Being new, I will order my parts online. What else need to be replaced. I have 105, 000 miles on it. It appears to have a slow oil leak,(oil on my garage floor the next day when the vehicle is cold,strange finding). The mechanic did not see any oil leak under the car, but saw a little water leak and corrosion around the water pump. Hopefully that's enough information to get me started.