The BMW 3 SERIES (2005-12) 320D 4DR SALOON 2.0D DPF 184 M SPORT STEP AUTO6 is a premium four-door saloon, positioned between mainstream company cars and executive models. M SPORT styling adds a purposeful look, and the automatic gearbox eases driving. It competes with the Audi A4 and Mercedes-Benz C-Class. Mycarcheck.com records 1,528 look-ups covering 484 different VINs, a sample that shows buyer interest. Checks show an average private-sale value of £4,000 and average recorded mileage of 114,000 miles; average annual use is 8,000 miles. The typical car has had about five previous keepers, so compare each car's history carefully. The 320d suits commuters and families, with motorway travel and rear seats. M Sport trim adds sporty appeal, while the automatic is handy in traffic and on longer trips. It balances performance, comfort and economy for a saloon. As these cars age, check service history, condition and mileage before buying.