The MERCEDES-BENZ S CLASS (1999-06) S320 4DR LIMOUSINE 3.2CDI SE AUTO is a large luxury saloon, positioned above everyday family cars in the UK used market. Its four doors, spacious cabin and comfort-focused design make it well suited to long journeys. Mycarcheck.com has recorded 18 look-ups across six distinct VINs, a small sample. Those checks show average mileage of 137,000 and annual use of 5,000 miles. The average private-sale valuation is £2,500, while recorded cars had around 1.3 previous keepers, a notably low average. Known for a quiet ride, roomy cabin and prestige, its diesel suits relaxed motorway journeys. It appeals to business users, comfort-seeking drivers and families needing space, though upkeep can exceed mainstream saloons. Against BMW 7 Series and Audi A8 rivals, it majors on traditional Mercedes comfort. Check service history and condition carefully before buying. Buyers should budget for age-related repairs and choose a carefully maintained example.