The MERCEDES-BENZ S CLASS (1999-06) S350 4DR SALOON 3.8 SE AUTO is a large, four-door luxury saloon, sitting near the top of the UK executive-car market. It was designed to make long journeys calm and comfortable, with a spacious cabin and an understated, prestigious presence. Compared with mainstream family saloons, it prioritises refinement and passenger comfort over low running costs or easy city parking. mycarcheck.com recorded five look-ups covering just two distinct VINs, so its figures are useful context rather than a broad reliability verdict. Across those checks, average private-sale valuation was £2,200, average recorded mileage was 79,000, and annual mileage averaged 4,000. The cars had an average of 3.8 previous keepers, worth checking against the individual vehicle’s history. Best suited to buyers wanting long-distance comfort or an affordable taste of prestige, it favours refinement over economy. Like BMW 7 Series and Jaguar XJ, it offers generous space and status.