Detailed item info Model OverviewThe 5-Series is offered with three different engines--designated by the models 528. 535 and 550. A 230-horsepower. 3. 0-liter in-line six-cylinder engine is standard on 528 models; 535 models get a 300-horsepower. turbocharged 3. 0-liter six. A 4. 8-liter V-8 engine making 360 horsepower comes in the 550. The 528 models are offered with rear-wheel drive or all-wheel drive. as are the 535 models. while the 550 is only available with rear-wheel drive. Each of the models comes with a standard six-speed manual transmission. A six-speed automatic transmission with Steptronic shift command is optional. The M5 model resides at the top of BMW's performance lineup. It's powered by a monster of a V10 engine that makes 500 hp and 383 lb-feet of torque. Power gets to the road via a 7-speed sequential transmission. The M5 utilizes a specially tuned sport suspension and unique cross-drilled disc brakes. M5-specific 19" wheels all around. a special spoiler and air diffuser also distinguish the M5 sedan from the rest of the 5-Series. The most popular 5-Series configuration is four-door sedan. but a five-door wagon is also available. only in all-wheel-drive 535xi trim. The wagon comes with a cargo cover. cargo net. and under-floor storage compartment. The 5-Series models have a roomy interior. with front seats that are excellent for long trips. enough back seat space for adults and. in sedans. a very roomy trunk. The instrument panel looks deceivingly simple. with a streamlined. horizontal design. but there's an underlying complexity in the iDrive controller that's needed to access some functions. Though the standard suspension setup is already quite firm. rear-wheel-drive models can be specified with a Sport Package. which brings a tighter Sport suspension. grippy multi-contour front seats. and upgraded wheels and run-flat performance tires. The package also includes Active Roll Stabilization. a system that simulates much stiffer anti-roll bars with an electronically controlled pump system. Another performance option is Active Steering. which actually helps steer the car back toward a more stable situation when the electronic stability control intervenes. The 5-Series comes with front side airbags and head-protecting airbags for front and rear outboard occupants. Rear side airbags. a still-rare feature. are optional. Compared to other mid-size sport sedans. the 5-Series is a technology powerhouse. To help increase alertness and safety. there's a lane departure warning system; a night vision system is available. which might help spot and avoid animals up ahead after dark; and BMW's active cruise control is one of the most advanced offered. capable of stopping and restarting in traffic. Other unusual options include a head-up display. high-definition (HD) radio and a high-beam assist feature.