The BMW 6 SERIES (2007-10) 635D 2DR CONVERTIBLE 3.0 AUTO is a large, premium four-seat convertible, sitting above everyday open-top cars and aimed at buyers wanting comfort, presence and long-distance ability. In the UK used market, it is a stylish alternative to a luxury coupe or grand tourer, rather than a practical family hatchback. Mycarcheck.com records 15 look-ups covering five distinct VINs, so the sample is modest. Those checks show an average private-sale valuation of £5,100 and average recorded mileage of 110,000 miles. Average annual mileage is 6,000, with around 2.8 previous keepers. These figures offer useful context, but individual cars can differ considerably in condition and history. Best suited to couples or households, it offers relaxed motorway travel and weekend escapes. Its strong diesel and automatic bring effortless pace. Against Mercedes-Benz CLK Cabriolet, the 635d is a capable grand tourer; check service history, roof operation and condition carefully before buying.