The MERCEDES-BENZ S CLASS (2006-09) S320 4DR LIMOUSINE 3.0 CDI AUTO is a full-size luxury saloon, built for comfort and presence rather than city parking or low-cost motoring. Its long design and automatic transmission suit executive travel, chauffeur duties and relaxed motorway journeys. In the UK used market, it sits among premium flagships such as the BMW 7 Series and Audi A8. mycarcheck.com records 1,750 checks covering 622 different VINs, a substantial sample of interest in this older S-Class. The average private-sale valuation is £4,600, while recorded cars average 128,000 miles and around 6,000 miles a year. They have had nearly five previous keepers on average, so condition and history deserve careful checks. The S320 CDI is best for buyers wanting a spacious car for long trips, not first-time drivers seeking cheap running costs. Against rivals, its appeal is the S-Class’s comfort and prestige, but age makes a careful check essential.