Major update improves a true sports sedan.

Introduction

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. 

This car has just about everything you could ask for in a luxury sedan, including the features, comfort and convenience of full-size luxury models, the sporting character of smaller ones, and a good compromise between interior space and physical bulk. 

The 5 Series line offers more model choices than most cars in its class, with prices spread from the mid-$40,000 range to over $90,000. Even the base 528i boasts spirited performance, with decent fuel economy to lower operating costs. The 300-hp six-cylinder in the 535i matches some V8s, while the V8-powered 550i delivers true high performance by any definition. The limited-production M5 can out-accelerate, out-brake and out corner some expensive sports cars, with comfortable seating for five. There's a wagon for those who want more room for cargo and BMW's x-Drive full-time all-wheel drive for drivers in the snow belt. 

Now familiar, the 5 Series' flared-nostril front end and overall appearance may still make it difficult for some buyers to embrace. It's still loaded with the technology that's made it a benchmark for critics and auto industry engineers alike, and some of its systems and features have a dark side. The i-Drive point-and-click control system, for example, takes time and energy to learn, and drivers who aren't willing to invest the energy, or those who just prefer things simple, might want to look at another car. 

However, those who put driving satisfaction first should put the 5 Series near the top of their test-drive list. 

Lineup

With new engines and more power for 2008, BMW's numeric nomenclature for six-cylinder 5 Series models has changed. But the model line hasn't really changed at all. There are two six-cylinder engines, a V8, and an ultra-high performance V10, manual and automatic transmissions and optional all-wheel drive. The 5 Series Sports Wagon is offered only with the more powerful six-cylinder and all-wheel drive. 

The least expensive 5 Series is now the 528i ($44,300), powered by BMW's high-tech magnesium alloy 3.0-liter inline 6 generating 230 horsepower, or 15 more than the previous 525i. With all 5 Series models, buyers can now choose either a six-speed manual or six-speed automatic transmission for the same price. The 528xi ($46,500) adds BMWs x-Drive automatic all-wheel drive system. 

The 528s come with leatherette upholstery, dual-zone automatic climate control with active micro-filtration, an AM/FM/CD stereo with 10 speakers, 17-inch alloy wheels, four power outlets and a rechargeable flashlight in the glovebox. 

The newly designated 535i ($49,400) and 535xi ($51,600) get a 300-hp, twin-turbocharged 3.0-liter six launched in 2007 3 Series cars. That's an increase of 45 horsepower over the former 530i. The 535xi Sports Wagon ($54,000) has x-Drive all-wheel drive. All 535s add xenon adaptive headlights. 

The most popular option for the six-cylinder models is the Premium Package ($2,300 for 528i, $2,100 for 535i), which adds Dakota leather upholstery, a universal garage door opener and the swanky interior lighting package with ambient light, auto-dimming and outside approach lighting. 

Those items come standard on the 550i ($58,500), which is powered by a 360-hp, 4.8-liter V8. The 550i also comes with Park Distance Control parking assist. 

For 2008, the 535s and the 550i can be equipped with a Sport Automatic ($500) transmission, which adds paddle shift bars on the steering wheel and shifts more crisply in manual mode. BMW's Sequential Manual Gearbox, which works like a manual without a clutch pedal, is no longer offered on any 5 Series except the ultra-high performance M5. 

The M5 ($82,900) sits atop the 5 Series lineup. It's powered by a hand-built 500-hp 5.0-liter V10, with suspension and brakes enhanced to match all the power, offered with either a six-speed full manual or a seven-speed SMG clutch-less manual gearbox. 

Two big ticket options have been added for 2008. BMW's Lane Departure Warning system ($500) is camera based, and notifies the driver via mild steering-wheel vibration of any movement that might indicate an inadvertent lane change. The new Stop and Go feature for Active Cruise Control ($2,400) is space age. Like the previous system, it uses radar to keep the 5 Series from moving to close to a car ahead, without driver intervention. Yet the new Stop and Go system works even in heavy traffic, accommodating speeds all the way down to a complete stop, and resuming to the set speed from 0 mph. 

Other option groups include: the Cold Weather Package ($750), with heated front seats, heated steering wheel and heated, high-pressure headlight washers; the Sport Package ($2,800 for six-cylinder models, $1,300 for all-wheel drive and $4,600 the 550i), with BMWs Active Steering and Active Body Control systems, larger wheels with performance tires, more potent brakes and sport seats; and Logic7 audio ($1,200) with six-CD changer. 

Stand-alone options include a navigation system ($1,900), a folding rear seat ($475), Sirius satellite radio ($595), and a new auxiliary iPod/USB jack ($400). HD Radio ($500) delivers enhanced digital audio quality, with FM reception that compares to CD quality and AM reception comparable to analog FM. BMW's head-up display, or HUD ($1,200), projects speed and other data on the windshield, while Night Vision ($2,200) uses a thermal-imaging camera that monitors the road ahead and displays images on the navigation screen before they might be visible to t. 

Walkaround

For 2008, the BMW 5 Series has been mildly updated with what the auto industry calls a facelift. Most of the styling touch-up lies in subtle details, but in our view they add character to this luxury sedan. 

Looks aside, many buyers will find the five-passenger 5 Series a near-perfect size. It seems more substantial than some small luxury or sport sedans, with more usable interior space. At the same time it's no so physically bulky as large sedans, and easier to maneuver in tight spaces or park. 

BMW's recent approach to exterior design has been discussed as frequently as any in the car world, and more than occasionally criticized. On the 5 Series at least, the curvy front-end, flat sides and high rear deck stand out less than they once did. That could simply mean we've grown more familiar with the shape, rather than more appreciative. 

The critics contend that, with the kabuki-eyebrow look in front and the chunked-off shape of the trunk lid, the 5 Series seems almost like two halves taken from different cars. In our view, the lines create a fairly compact appearance, and that may be part of the problem. The 5 has the appearance of a well-built mainstream sedan, and that may not be the precedent one expects for an expensive European job. It also has a few too many lines. Those character lines crossing the rear end, or the double creases framing the hood, seem a bit overdone. In any case, none of this seems to have hurt 5 Series sales, and five years into its model run the current generation has subtly evolved. 

The 2008 tweaks start in front, where the headlight covers are now completely clear, with chrome surrounds highlighting individual lights inside. The chrome edging on BMW's trademark double-kidney grille is now flush with the surface on the front air dam, while the full-width air intake below the front bumper curls up in the corners to match the shape of the headlights. 

Below the doors, the 5 Series side sills have been re-contoured a bit for 2008, apparently to promote a longer, leaner look. In back, the rear lights are covered with the same clear glass as the fronts, and the turn signals are now LEDs. 

Those comma-shaped, wraparound taillights apply a technology introduced by BMW that has spread to a number of makes. The company calls them adaptive brake lights, and they illuminate more intensely, over a larger area, when the ABS system engages. Or in other words, when the driver is stopping has hard as possible. The point is to inform drivers in cars following the 5 Series that it's stopping quickly, possibly in an emergency situation. It could help, but only if the driver following correctly interprets the increased intensity of the brake lights. 

BMW re-introduced a 5 Series wagon for 2006. The big difference, of course, lies behind rear roof pillars and seats, where the 5 Series Sports Wagons offer more load-carrying potential and versatility than the sedan. The rear gate opens electrically, with a switch on the key fob or dashboard, and swings very high for easy access to the load floor. A big reflector on the bottom of the gate adds an element of safety in darkness. 

The gate also has a soft-close feature. When it's lowered, it automatically sucks itself shut, no slamming required. The glass window opens separately, which is convenient when dropping a briefcase or a couple of bags in back. 

Interior

Like its exterior, the BMW 5 Series interior has been updated with some notable changes for 2008. We'd call them an improvement. Aesthetically, the cabin is warmer and a bit more inviting. From the functional perspective, a couple switch changes add convenience. 

This 5 Series sedan is roomier than those built prior to 2004. Front passengers have a fraction more shoulder and head room, but the improvement is more obvious in the back, where there's more shoulder room and a lot more legroom. Increased cabin space put the 5 Series on better footing with key competitors like the Mercedes E-Class, Audi A6, and Lexus GS. 

The finish and quality of materials inside have been improved as well. Soft plastics covering the dashboard and doors are more handsome and rich to the touch compared to 5 Series models built a few years ago. The seats feature a draped-leather look, with the upholstery hung loosely rather than pulled taught over the seat frames. Leather inserts in the front door panels compliment the seats. 

The most obvious change for 2008 is the two-tone finish on the door panels. The tops are covered in back while the lower portion matches the interior color. The look adds depth and enhances the visual integrity of the doors and dashboard. The same goes for an increase in the amount of wood trim. Wood now flows from the instrument panel into the door panels, creating a more integrated look. 

Our test car had the new Bamboo wood trim, stained very close to black. We liked it a lot. The walnut-colored dark Poplar trim is the most traditional, while the light Popular is almost blond. Any of the three are available at the customer's choice, no additional cost. 

The standard 5 Series seats are very good, with above-average support and just enough give to keep from feeling hard. The seats in the optional Sport Package on our 550i have so many adjustments that those who lean toward obsessive/compulsive may start stressing out as they try to settle in. If you can get them just right, save the position in memory, because these are some of the best seats in the business. They're firm, but not church-pew hard like the previous generation sport seats. 

The 5 Series dashboard applies BMW's familiar double-wave theme, with one wave or bubble over the instrument cluster, defining the driver's area, and another that begins over the dash center and sweeps toward the right side. From a functional view point, it's an effective design. The instrument cluster features two gauge pods, with the gas gauge wrapped inside the analog speedometer and a miles-per-gallon gauge inside the tach. The tachometer has a variable warning LED that circles the gauge. When the engine is cold, this LED extends to 4200 rpm, then gradually increases the rpm limit to the redline as the oil warms up. 

The dash center is dominated by a large electronic screen that displays various control functions, system readouts and the navigation map or Night Vision image when the car is so equipped. There are vents below the screen and on either side off the steering column that move an impressive quantity of air with minimal fan noise. 

The biggest improvement might be the relocated window switches. For 2008, they're now flat in the armrest on the door, rather the above the armrest on the door panel, and sit right at the fingertips when the driver's arm lies on the rest. And the mirror adjustor sits just beyond the window switches, rather than further up the panel as before. 

Beyond these, manual control switches are few. Three big climate control knobs sit below the display screen, for fan speed, temperature and airflow direction. There's also a volume knob next to the CD slot, a station selector on the right steering wheel spoke, and phone controls on the left spoke. In short order, these knobs will become the 5 Series driver's best friends. 

That's because almost everything else, including some basic stereo functi. 

Driving Impression

The big news for the 2008 BMW 5 Series sedans lies under the hood of the six-cylinder models. For 2008, the base 528i gets a horsepower increase that makes it the most powerful entry-level 5 Series ever. With a new twin-turbo engine, 535i and 535xi Sedans and Sports Wagon are the quickest six-cylinder-powered 5 Series cars yet. The six-speed Steptronic automatic transmission has been improved as well, and buyers can choose manual or automatic for the same price in all models. 

In any iteration, the 5 Series is pleasure to drive, though it's hard to say which model we'd choose. The least-expensive 528i feels delightfully light on its feet for a clean, satisfying driving without a lot of high-tech aids to get in the way. On the other hand, those high-tech systems like BMW's Active Steering or Active Roll Stabilization can quickly demonstrate their value, and there's nothing quite like the thrust developed when you slam the accelerator down in a 550i. 

The 5 Series is not whisper quiet like the BMW 7 Series, so a bit more road and ambient noise finds its way into the cabin. Yet with the stereo turned up about two-tenths of the way, you won't hear any of it. And the 5 Series feels smaller on the road than its dimensions suggest. Consider its near-perfect weight balance, and a rock-solid body that's free of creaks, rattles or unpleasant vibration, and this BMW is exactly what we'd like a luxury sedan to be: smooth and comfortable regardless of the speed, nimble and reassuring when it's appropriate to travel at a good clip. The 5 Series has nearly all the bells and whistles, and almost nothing to diminish the driving experience. If you decide to pick up the pace, you'll discover handling and overall performance that's hard to match in any sedan. No matter which engine sits under the hood, there's plenty of power to get you up to speed. 

The 5 Series engines were updated for 2008. They were overhauled for 2006, starting with a new inline six cylinder that is the only current production engine with a magnesium alloy engine block to reduce weight. The engines in the 2008 BMW 528i and 535i are actually the same size, 3.0 liters. 

The 528i engine generates 230 horsepower and 200 pound-feet of acceleration-producing torque, or 15 more of each than the 2007 525i, thanks to improvements in tuning and control systems for 2008. 

The 535i engine is considerably different. It has gasoline direct injection, the most advanced means of delivering fuel to the cylinders, and twin turbochargers that boost power to 300 horsepower and 300 pound-feet of torque, or 45 horsepower and 80 pound-feet more than the 2007 530i. That's more power from a six-cylinder than the V8-powered 5 Series cars had a few years ago. 

BMW's inline six-cylinder engines remain one of the great experiences in motoring. The classic straight six delivers a balance of smoothness, torque, and response that V6 engines can't seem to match. Other luxury manufacturers have switched to V6s because they're easier to package, and they've proven easier to certify for stringent emission standards. We're glad BMW sticks with its trademark inline engines. 

The 535i's twin-turbo 3.0-liter engine might be the finest yet. From a stop or a high-speed roll, the 535i delivers as much torque or more than some thirstier V8-powered sedans. Off-the-line acceleration surpasses probably 80 percent of the vehicles on the road, and top speed exceeds anything you'll get away with anywhere outside desolate Nevada desert. Power delivery in the 535i is very linear, even with the turbochargers, meaning that you'll get the same response and acceleration whether the engine is turning 2500 rpm or 5000 rpm when you step on the gas. There's virtually no turbo lag in this engine. 

The 550i with its V8 engine appeals to those who put a premium on straight-line acceleration and turbine smoothness. This 4.8-liter engine de. 

Summary

The BMW 5 Series is a true driver's car among mid-sized luxury sedans. Increased power and other improvements for 2008 only emphasize this. The 5 mixes comfort, performance, high-tech features and passenger-friendly accommodations in fairly compact package. Any 5 Series is remarkably well balanced, and satisfying to own and drive. 

NewCarTestDrive.com correspondent J.P. Vettraino filed this report from Detroit, with Mitch McCullough reporting from Charlottesville, Virginia. 

Model Lineup

BMW 528i ($44,300); 528xi ($46,500); 535i ($49,400); 535xi ($51,600); 535xi Sport Wagon ($54,000); 550i ($58,500); M5 ($82,900). 

Assembled In

Dingolfing, Germany. 

Options As Tested

Sport Package includes Active Steering, Active Roll Stabilization, 19x8.5-inch cast alloy wheels with W-rated run-flat tires ($4,600); Cold Weather Package includes heated front seats, steering wheel and high-pressure headlight washing jets ($750); on-board navigation system ($1,900); Logic7 audio ($1,200) with six-CD changer; HD Radio ($500); Sirius satellite radio ($595).