The BMW 5 SERIES (2003-07) 523I 4DR SALOON 2.5 SPORT is a premium four-door saloon, aimed at buyers wanting more space and comfort than a family hatchback. In the UK used-car market, it sits among executive cars such as the Mercedes-Benz E-Class and Audi A6, with a driver-focused character. With a smooth petrol engine, comfortable cabin and composed ride, the 523i suits longer commutes, business travel and family journeys, especially for drivers who value relaxed cruising and engaging handling. The Sport version adds a purposeful look, while its generous saloon boot and rear-seat room make it practical for everyday use. It feels more substantial and refined than many mainstream alternatives. mycarcheck.com records 59 look-ups across seven VINs. Cars averaged £1,400 private-sale value, 135,000 miles, 1,000 miles annually and around nine previous keepers. Check each car’s history and condition carefully; age and use can vary considerably from one car to another.