The AUDI A4 (2005-08) S4 4DR SALOON 4.2 QUATTRO 344 is a compact executive sports saloon: a practical four-door Audi with a powerful 4.2-litre petrol engine and four-wheel drive. It sits above ordinary A4 models, offering a faster, more focused alternative to everyday family saloons while remaining usable for regular journeys. Mycarcheck.com recorded 314 look-ups covering 96 distinct cars, a useful sample of buyer interest. Across those checks, the average private-sale value was £5,000, latest recorded mileage averaged 111,000 miles, and annual mileage averaged 4,000. Cars had an average of 6.6 previous keepers, so check each car’s history and condition carefully. The S4 suits drivers seeking a family or commuting saloon with strong pace and all-weather confidence, though fuel and upkeep can be expensive. Against BMW 3 Series and Mercedes-Benz C-Class rivals, it offers discreet style, four-wheel-drive grip and a distinctive engine note. A carefully checked, characterful used Audi for keen drivers.