I am interested in the old s4. The qualities of the 5Cyl. are known to me, only that most of the specimens on the market have quite heavy kilometers on it or automatic – or even both. What to hold of the 4.2L V8 (macking / mileage / maintenance) for how much useful gas conversion – because over 21literr in the city are quite nice. That would be the most important questions for the first time…