Well, I had a 2004 Audi A4 a year ago, had oil sludge problem, they fixed it just right away.Even I waited there for 4 hours. It's worth to wait. After they repaired my car, the car runs smooth as hell. now I have a E46 with few cons that need to be fixed. I think they will do the great job, too. Also, I think the price is less than a dealership, and more professional from my point of view.