The BMW Z4 (2018-22) M40I SDRIVE 2DR ROADSTER 3.0I 340 GPF SS EU6 TECHNOLOGY SHADOWLINE PLUS PACK AUTO8 is a premium two-seat sports roadster, not a family car. Its folding roof and sleek shape bring open-air motoring to the upper end of the UK used-car market. As the range’s performance version, it combines lively acceleration with an eight-speed automatic for relaxed or spirited drives. The mycarcheck.com sample is substantial: 649 checks covered 361 different VINs. Across those records, the average private-sale valuation was £36,500, with average recorded mileage of 19,000 miles and annual mileage of 4,000. Owners had averaged about one previous keeper, suggesting many examples have had limited ownership changes; figures are useful context, not a price guarantee. This Z4 suits enthusiasts wanting a weekend car, though it can commute comfortably too. Against rivals such as the Porsche 718 Boxster, it stands out for combining comfort, performance and everyday usability.