Freshened styling and new 6-cylinder engines mark the 2008 BMW 5-Series. These midsize sedans and wagons come in rear- and all-wheel-drive versions. The lineup starts with 528i and all-wheel-drive 528xi sedans, which replace the 525i and 525xi. One step up are the 535i sedan and AWD 535xi sedans and wagons, which replace the 530i and 530xi. The 528 and 535 have a new 3.0-liter 6-cylinder engine; it makes 230 horsepower in 528s, 300 in the turbocharged 535s. Unchanged for '08 are the 550i sedan, which has a 360-horsepower V8, and the high-performance M5, which has a 500-horsepower V10 and sport suspension. All are available with a 6-speed manual transmission.