The MERCEDES-BENZ S CLASS (2017-20) S400L 4DR SALOON LWB 2.9D DPFR SS 340 EU6 AMG LINE EXECUTIVE PREMIUM PLUS 9G-T+ AUTO is a full-size luxury saloon, with an extended wheelbase that prioritises rear-seat space. It sits at the top of the UK executive-car market, offering a more formal, spacious alternative to mainstream family saloons. Its long body suits chauffeur-style travel as well as private ownership and business journeys alike. Mycarcheck.com records 270 look-ups across 71 distinct VINs, a useful sample for this specialised model. Checks show an average private-sale valuation of £32,600 and average recorded mileage of 85,000 miles; owners had averaged 18,000 miles a year. The cars had about 1.7 previous keepers on average, suggesting relatively low ownership turnover. This S400L pairs a diesel engine and automatic transmission with AMG Line styling and a comfort-focused cabin. It is best suited to executives, frequent motorway drivers and families wanting generous rear space, not tight-city parking. Against the BMW 7 Series and Audi A8, it is known for refinement and prestige.