The BMW 5 SERIES (2003-07) 523I 4DR SALOON 2.5 M SPORT AUTO is a large, premium four-door saloon, offering more space and comfort than a family hatchback. In the UK used-car market, it belongs to the executive-car class, traditionally rivaling the Mercedes-Benz E-Class and Audi A6. Its M Sport styling gives this 523i a more purposeful look. mycarcheck.com records 134 look-ups across 41 distinct VINs, a useful snapshot of buyer interest rather than a complete picture of every car. Checks show an average private-sale valuation of £1,800 and average recorded mileage of 116,000 miles; typical annual mileage is 6,000. The average keeper count is about seven, so review each car’s history carefully. With its smooth petrol six-cylinder engine, automatic gearbox and comfortable cabin, the 523i suits commuting, journeys and family duties. M Sport trim adds appeal, while age and mileage make condition, maintenance and paperwork especially important when comparing examples.