Substantial improvements to the BMW 5 Series sedans and wagon for 2007 add a lot, but change little. The 5 Series remains a truly sporting sedan that stands out in the fiercely competitive market for mid-sized luxury cars.

Changes for 2008 represent the most significant model-year update since the current 5 Series was launched in 2003. They include mild exterior revisions, improvements to the interior and a significant power boost for six-cylinder models. The new 528i, formerly the 525i, is the most powerful entry-level 5 Series to date. The twin-turbo 535i, formerly the 530i, is the quickest six-cylinder 5 Series car ever. The change in BMW's numeric naming scheme is a result of the change in engines, but the various models and their relationship to each other remain basically the same.

Their basic character hasn't changed a bit, because every 5 Series puts an emphasis on the driving. This mid-size luxury sedan remains a true sports sedan in any of its variations, including the 535xi wagon and other models equipped with all-wheel drive. Regardless of engine size or equipment level, the 5 Series line delivers lively acceleration, precise handling and outstanding brakes. It's available with a conventional manual transmission, which is increasingly hard to find in this class.