Minor equipment shuffling marks 2005 for BMW's 5-Series sedans. Three models are offered. The 525i has a 184-hp 2.5-liter inline 6-cyl engine, the 530i a 225-hp 3.0 inline 6. The 545i has a 325-hp 4.4-liter V8. For '05, the 545i joins the other two models in offering a standard 6-speed manual transmission. A 6-speed automatic is optional on all. Optional on the 530i and 545i is a 6-speed sequential manual transmission. SMT is essentially a clutchless manual operated via console lever or steering-wheel paddles; it can also be set to shift like an automatic.

Standard on all models are ABS, antiskid/traction control, front side airbags, and front and rear head-protecting tubular side airbags. Rear torso side airbags are optional. Also standard are BMW Assist emergency and concierge service and a tire-pressure monitor. All models have BMW's iDrive, which uses a console "joystick" knob to control entertainment, navigation, communication, and climate functions. The 525i has 16-inch wheels, the others 17s. Optional are a sport suspension teamed with run-flat tires, BMW's Active Roll Stabilization designed to counteract body lean, and BMW's Active Steering that electronically varies steering ratio and assist. Other options include head-up instrument display, satellite radio, and adaptive cruise control designed to maintain a set following distance. Also available are a navigation system, front and rear obstacle detection, heated front and rear seats, and xenon headlights.