Hey, Im gonna be buying a used S4, an 87 or 88, and I was wondering what common problems I can check for when I go to look at the car? Its going to be used as a rwd learner car for me, and to use for school. I found a couple GX's for around $3000 CAD. So some common problems that I can check for would be great. Also, whats about the highest mileage I should look at? I have heard that NA 13b can go a couple hundred thousand kilometeres. Some help would be much appreciated, thanks.

Chris