The MERCEDES-BENZ S CLASS (1999-06) S55 AMG 4DR SALOON 5.5 AUTO is a large luxury four-door saloon, built for comfort, space and effortless pace. In the UK used-car market, it sits among high-end executive cars, offering a more powerful alternative to ordinary S-Class models and a distinctive rival to performance saloons from BMW and Jaguar. Mycarcheck.com records 161 look-ups covering 23 different VINs, a useful but still modest snapshot. Across those checks, average recorded mileage was 117,000 miles, annual mileage 3,000 and previous keepers about 5.4. The average private-sale valuation was £1,400; treat this as an indication, not a guaranteed price, because age, condition and history matter greatly. This S55 AMG suits buyers wanting a refined long-distance car with acceleration and a prestigious presence, rather than low-cost motoring or a first car. Its hand-finished feel and sporty character make it special, but running costs can be substantial; checks are essential.