The MERCEDES-BENZ S CLASS (2017-20) S400L 4DR SALOON LWB 2.9D DPFR SS 340 EU6 AMG LINE PREMIUM 9G-T+ AUTO is a long-wheelbase luxury saloon, sitting at the spacious, high-comfort end of the UK executive-car market. It prioritises rear-seat room and refinement over compact size or low running costs. With its extended cabin, smooth automatic drive and AMG Line Premium presentation, this S-Class suits business users, chauffeur work and families wanting a particularly comfortable long-distance car. It offers a more cosseting, prestigious experience than many mainstream saloons, while rivals such as the BMW 7 Series and Audi A8 target the same premium class. The diesel engine is designed for covering distance, rather than frequent short urban trips. mycarcheck.com has recorded 115 checks across 29 distinct VINs, a helpful but limited snapshot. Records show average mileage of 45,000 and about 9,000 miles a year; cars had around one previous keeper. The average private-sale valuation was £35,500, a guide, not a guaranteed price. Check each car’s history and condition.