Since 1996, Mercedes-Benz has sold over a half million SLKs, making it best-selling luxury roadster in the world, bar none. To keep the competition at bay, Mercedes has tweaked all three grades of its retractable-hardtop hottie. But first, let's look at the lineup: For 2009, all models get new shoes and a nose job -- trimmed back a bit, with the wings fleshed out for a more Formula 1 look. Larger mesh in the grille and redesigned foglamps round out the front-end revisions. The back has been cleaned up, too; taillamps are now tinted, exhaust tips are squared off, and the accent lines have been rubbed out. The lower valence has been styled to look like a diffuser. Interior changes are even harder to spot: Redesigners freshened up the instrument cluster and head unit, which has also been updated with Mercedes's next-generation NTG 2.5 electronics system. There's also a new three-spoke steering wheel, which now controls Benz's new Direct Steer system, but we'll get to that in a moment.For individual models, there are few additional changes. The 2009 SLK280 nameplate goes away, replaced by SLK300, even though Mercedes made no change to the 3.0-liter, 228-horsepower V-6. At least its naming convention for its mildest roadster is now consistent. Pricing hasn't been released, but Mercedes informs us it'll stay near 2007 levels.At the extra-spicy-crispy end of the spectrum, the SLK55 AMG remains essentially unchanged, aside from the aforementioned tweaks. Affalterbach's hot-rodster still packs 5.4 liters of V-8 heat, detuned to 355 horsepower and paired with the same paddle-shiftable seven-speed automatic transmission. Additional AMG treatments include sexier aero parts, 18-inch alloys, beefier 325mm brake discs, a sportier flat-bottom steering wheel, and a 200-mph speedometer.The middle-child SLK350 gains the biggest improvements in the form of a significantly modified 3.5-liter engine. Changes include lighter pistons, stronger valves, and conical valve springs, as well as a redesigned intake manifold and higher compression ratio (11.7:1 versus 10.7:1). Camshaft position has also been advanced five degrees on both the intake and exhaust sides. All told, these changes have resulted in gains of 32 horsepower and 7 lb-ft, torque, to 300 and 265 respectively.So with all these changes, is it possible to feel the difference from the driver's seat?No, not really.Don't get me wrong, both the $50,000ish SLK350 and $65,000esque SLK55 AMG are fine-driving vehicles. It's just that, with the top down, who can discern a 32-horsepower improvement? Everything feels fast and sounds good -- particularly when the V-6 sings lustily near its 7200-rpm redline and barks a bit on the seven-speed transmission's throttle-blipped downshifts.Ditto for the 55, though its tone is less tenor and more bellicose baritone; jump off the gas and hear that back-pressure burble. It's positively fearsome when you're top-down and wide open in tunnels and canyons.What you can feel is a decided improvement in the steering feel. Mercedes implemented its new Direct Steer system on the SLK and it's a throwback -- a mechanical solution in the age of complicated electronics and algorithms. The problem Direct Steer attempts to address is the balance between freeway-cruising comfort and canyon-carving sharpness. The heart of this variable ratio system is a steering rack with specially shaped and spaced teeth. A standard pinion gear rides on top, but as it turns the steering ratio can change dramatically and instantly because it's all done mechanically (with hydraulic power assist, of course).Mercedes claims the number of turns from lock to lock has been reduced by 25 percent, and on the road, the SLKs felt noticeably sharper, without that dead spot on-center. More important is that the system is natural and progressive, free of that disconnected, artificial feel many of the steer-by-wire systems have. It's not perfect, but it is a definite improvement.Not a bad a way to sum up the 2009 SLK line.

The Mercedes-Benz E-Class features more powerful engines for 2008, along with subtle styling changes, new interior elements, and a few tweaks for handling and safety. The E-Class in many ways epitomizes the Mercedes-Benz brand. It's the company's best selling line worldwide and one of the best-selling Mercedes models in the United States. The E-Class describes a full line of big, roomy sedans that are solid, safe, practical, comfortable, luxurious, and fast. Yet the cost of operating the popular E350, in terms of fuel consumption and maintenance, can be quite reasonable. The E-Class features some of the industry's most advanced safety technology, and it expresses what most people think of when they think of Mercedes: status in elegant, understated fashion. Since a frame-up overhaul for model year 2003, the E-Class has expanded steadily and now includes six variants (more if you count the all-wheel drive E350 4Matic sedan and wagon and E550 4Matic sedan as separate models). The E-Class has sedans that seat five, wagons that seat seven, power from a V6, two V8s and a turbocharged V6 diesel, optional weather-busting all-wheel drive and screaming super-performance models from supertuner AMG. For 2008, there are changes in E-Class nomenclature, thanks to new engines. The E500 sedan has become the E550 sedan, the new badge indicating it's powered by the 5.5-liter V8 that first appeared in the 2006 S-Class. The E550's double overhead cam V8 generates 382 horsepower compared to the 302 horsepower from the single overhead cam V8 it replaces, yet with a seven-speed automatic transmission, the E550 achieves the same estimated mileage as its less powerful predecessor. The E550 4Matic sedan retains its five-speed automatic. The E350 benefits from a V6 that was upgraded last year and is offered as a sedan and a wagon. Meanwhile, there is no better example of how far passenger car diesel technology has advanced than the new E320 Bluetec sedan, which replaces the E320 CDI. The impressive common-rail direct-injection turbodiesel engine comes with a more sophisticated exhaust system that makes it the only diesel-powered passenger car available in the U.S. during the 2008 model year. It's not only more powerful than the outgoing E320 CDI with 210 horsepower and a muscular 388 pound-feet of torque, but it also returns the outgoing CDI's excellent EPA-estimated fuel mileage of 27 city/37 highway mpg. Also new for 2008 are the E63 AMG sedan and wagon. It's hard to conceive of a faster, sportier team of luxury cars than the outgoing E55 AMGs, but the completely new 507-hp 6.2-liter V8 that replaces the E55's 469-hp supercharged V8 makes the E63s the fastest E-Class models ever built. And though capable of monstrous acceleration (0 to 60 mph in just 4.3 seconds) and a top speed of 180 mph (were it not for electronics that limit top speed to 155 mph), the AMGs boast the touches of luxury expected at the upper end of the market. The Mercedes E-Class is an icon, a benchmark in its class. The mid-life freshening for 2008 helps the E-Class keep pace with such outstanding luxury sedans as the Audi A6, BMW 5 Series and Acura RL.

Model Lineup
The Mercedes E-Class lineup can seem daunting and complex, yet there is only one primary choice: four-door sedan or wagon. From there, it's a matter of choosing the engine and whether you want 4Matic all-wheel drive. The E350 models come with a 3.5-liter V6 engine. The E350 sedan ($51,325) comes with a seven-speed automatic while the all-wheel-drive 4Matic ($53,825) has a five-speed automatic. E350s are available in Sport or Luxury trim. The E320 Bluetec ($52,325) is equipped identically to the E350 Luxury version, but features the turbodiesel engine. The E350 4Matic wagon ($56,475) is equipped comparably to the sedan. A power liftgate and cargo organizer are standard, along with a folding third seat that increases passenger capacity to seven. Standard features include fully automatic dual-zone climate control, 10-way power front seats with leather seating surfaces and memory, real burl walnut trim, a power tilt and telescoping steering wheel, a nine-speaker surround-sound stereo, power windows with one-touch express up and down, auto-dimming mirrors and rain-sensing windshield wipers. New standard equipment for 2008 includes a glass sunroof, six-disc CD changer, harman/kardon Logic 7 premium audio and, in the wagon, a power liftgate. Luxury trim comes with 17-inch wheels, comfort suspension, green-tinted glass and burl walnut wood trim. Sport trim includes 18-inch twin-spoke wheels, a sport rear bumper with dual exhaust pipes, lowered sports suspension, blue-tinted glass, black bird's eye maple wood trim, white gauges, and a matte chrome gearshift surround. Options include the Premium 1 package ($2,390) with phone pre-wiring, DVD navigation, Sirius satellite radio, power rear window sunshade and heated front seats. Premium II ($4,290) adds headlamp washers, a bi-xenon active light system, cornering fog lamps, and Keyless Go to that list. Also optional: a panorama sunroof ($1,000), electronic trunk closer ($520), split/folding rear seats ($300), radar-controlled Distronic adaptive cruise control ($3,160); a wood/leather steering wheel ($540); five-spoke chrome 17-inch wheels ($1,200); and Parktronic obstacle warning ($1,110). The E550 ($59,775) and E550 4Matic ($62,275) sedans are powered by the 382-hp V8, and it offers more standard equipment than the E350. Upgrades include a four-zone climate control system and Airmatic variable air suspension. Options include the Premium I package ($2,840), which adds active ventilated seats to the E350's similar package, while Premium II ($4,740) is identical in content to the E350's. The E63 AMG sedan ($85,375) and wagon ($86,175) include the 507-hp V8, a seven-speed automatic with steering-wheel-mounted shift paddles, massive 18-inch tires and wheels, performance brakes, a lowered chassis and an aggressively tuned air suspension. They're distinguished by unique body touches and interior trim, deeply sculpted sports seats and AMG markings. Options are similar to those on the other E-Class models. Safety features that come standard on all models include eight airbags: dual front airbags, side-impact airbags for front and rear passengers, and head-protection curtains that run the length of the cabin on both sides. The airbag management system employs multiple impact sensors designed to more precisely control the timing and rate of deployment. The system accounts for the weight of a front-seat passenger and controls seatbelt pretensioners according to the force of impact. Active safety features start with anti-skid stability electronics and the latest evolution of ABS. Safety is further enhanced by the Pre-Safe system, which was engineered to recognize critical situations as they develop and prepare both the passengers and the car for the crisis. If braking deceleration exceeds a certain level or the vehicle threatens to skid, the system tensions the front seatbelts, adjusts the position of the passenger seat for optimum positioning relative to deployment of the airbags, and closes the side windows and sliding sunroof, leaving only a small gap. In the event of a rear collision, the front head restraints move forward nearly two inches and upward by more than an inch, helping to support the head and reduce whiplash injuries.

Walkaround
Before the launch of the gorgeous CLS sedan/coupe, the Mercedes-Benz E-Class was widely considered to be the most successful design among the company's current sedans. For 2008, a slightly increased overall length and wider front and rear tracks does nothing to dispel the car's suave look. The four-headlight theme introduced on the previous-generation E-Class is now the company standard, but it has been refined further in the mid-life freshening of the 2008 car. Up front, the bumper and radiator grille now have a pronounced V-shape, the spoiler is lower, and, for a striking effect, the twin headlamps sport transparent louvers over their top sections. A finishing touch is the white LEDs used for the parking lights. The front end's new look for 2008 is carried to the rear along deeper side skirts to a new rear bumper and taillight configuration. Along with the new, more aerodynamically shaped single-strut rearview mirrors, the changes keep the E-Class looking fresh and youthful, yet elegant. The current E-Class design introduced many innovations not necessarily apparent to the eye. This was the first Mercedes sedan to use aluminum body components extensively, starting with the hood, front fenders, trunk lid, front crossmember and front subframe. Aluminum is lighter and stronger but more expensive than steel. Aluminum amounts to 10 percent of the body's weight. About 37 percent of the total is modern high-strength steel alloys. From the aerodynamic perspective, the E-Class is one of the slipperiest sedans extant. Its 0.27 coefficient of drag, identical to the 2006 model, is a benchmark for sedans and helps minimize wind noise and maximize fuel economy. The E-Class wagon, this year available only in E350 and E63 AMG versions, will never be mistaken for anything but a wagon. Nonetheless, it is impressively sleek, and some critics find the tear-drop taper of the rear roof more aesthetically pleasing than the trunk deck on the sedans. The exterior revisions on the sedan apply to the wagon. The wagon has been fitted with a larger center brake light. The wagon's added cargo-passenger flexibility is welcome. If the E350 wagon is too stodgy for your taste, there's always the new E63 AMG wagon. The E63 AMG sedan and wagon look meaner than the other E-Class cars. With their lower body cladding and 18-inch wheels, the E63s look racy and aggressive. As is often the case, the body add-ons add slightly more drag, if you can call a super slippery 0.28 Cd more drag. The aerodynamic aids are for downforce, to improve grip in fast corners.

Interior Features
We really enjoy the Mercedes E-Class interior. Like its exterior styling, we consider the E-Class cabin to be some of the marque's best design work, with a successful mix of attributes. The E-Class sedan delivers plenty of passenger space, yet it maintains some level of intimacy. It's luxurious, yet functional, and loaded with features without being excessive. The E-Class has all the traditional Mercedes interior cues, starting with its standard dark stained burl walnut trim. The cabin is conservative in some respects, daring in others, and impressively executed throughout. New for 2008 is a more elegant look, distinguished by sweeping curves, soft surfaces and effective use of chrome trim. A handsome four-spoke steering wheel with elliptical thumb-operated buttons is new, along with revised controls for the automatic climate system and additional interior color choices. The dashboard sweeps from each side and blends into the doors and center console. The wood trim is complemented by splashes of chrome. Plastic panels are generally rich in appearance and have a soft-touch finish. All are sprayed with a polyurethane coating that delivers impressively consistent color. The instrument cluster uses black script on white gauges with LED lighting. There's a big speedometer in the middle, with a menu-operated display for diagnostics, feature selection, ambient temperature, date and other information in its center. To the left sits a large analog clock, to the right the tachometer. On either end of the cluster are neat bar gauges that resemble thermometers, displaying fuel level and coolant temperature. A cluster of switches between the visors on the headliner controls cabin lighting and the Tele-Aid SOS call button. The panel also includes a switch to operate the sunroof. HomeLink buttons are located on the bottom of the rearview mirror and can be programmed to control garage doors, house lighting, gates, etc. Redundant controls on the steering wheel hub operate the phone, radio and information display. A single row of switches at the bottom of the center stack operates door locks, flashers and seat heaters. The main audio, telephone and navigation controls are located in a Comand module, spread around a 16:9 ratio LCD display screen. The system is a big improvement over Mercedes' previous control center, and while it still requires some learning, it probably takes less time to master than the menu/joystick system in many E-Class competitors. The new CD changer is located behind a flip-up switch panel in the center of the dash panel, which, at the touch of a button, opens for access to the changer. It can play audio CDs and MP3s, and an auxiliary input plug in the glove box allows personal audio devices to be played through the 12-speaker sound system. An optional kit connects the Apple iPod to the audio system and provides information in the center display while allowing control via the multi-function steering wheel. Mercedes is learning that people who drive cars carry stuff with them, at least Americans do. This E-Class has less storage space than some of its competitors, but acres more than any Mercedes did five years ago. The center console has a funky pop-up cupholder and a large storage bin (two bins if you don't order the telephone package). Storage bins are also located in each door along with map pockets on the front seatbacks. The 10-way adjustable front bucket seats are firm enough for good support when driving fast, but not hard on the back when cruising. They grip bodies of various sizes nicely, and there's more than enough adjustment via Mercedes' patented door-mounted seat controls to accommodate just about everyone. The sport seats have enough bolstering to keep a bronze bust in place. But if you don't dive into corners like Stirling Moss, you probably don't need them. They make getting in and out a little more difficult. We especially enjoy the Active Ventilated seats in the E550 and E63 AMG models on hot days, when they provide a welcome measure of comfort. Gripes? We didn't like the previous model's outside mirrors, which were too small, no doubt in deference to sharp styling and good aerodynamics, but the mirrors on the 2008 models are shaped better for viewing to the rear, and they're even more slippery in the wind. More significant is the cruise control. Mercedes' system still is managed with a stalk on the left side of the steering column, above the turn signals. At some point, no matter how long you've driven the car, you are going to hit the cruise control when you intend to turn on the blinker. Mercedes engineers insist that theirs is the most effective cruise-control operation going. We've yet to meet anyone who prefers it. The E-Class was one of the first cars to feature ambient cabin lighting. These strips of soft, low-level lighting in the headliner remain on during darkness, like a fancy nightlight in the bathroom. It's disconcerting while driving at night, at least initially, because we're used to nothing but the instrument lights. The distraction goes away as you become accustomed, but we're not sure the benefit of being able to see around the cabin outweighs the perceived loss of night vision and focus on the road. Ambient lighting is convenient for passengers who want to be able to see inside the cabin, however. A power glass moonroof that tilts and slides comes standard, but the Panorama roof can be ordered that offers twice the glass surface area. It features continuous glass that slides along the top of the body from the windshield to the rear window. The back seat has all the comforts of home. Separate air vents for both sides, a fan-speed switch and separate temperature adjustments help keep rear passengers comfortable. A 12-volt power point, reading lamps, and a wide, fold-down center armrest with cupholders and divided storage are provided. Headrests are provided for all three rear seating positions, yet the driver can retract them with the press of a button when there's no one riding in back for a greater range of rearward vision. The optional split/folding rear seat adds utility; get it if you haul stuff. The trunk is one of the largest in the class, with nearly 16 cubic feet of space. The trunk floor is as long as it is wide, with load height just above the bumper. The E-Class wagon offers 24.4 cubic feet of cargo space behind the second-row seats and 69 cubic feet with all the seats folded down. That's nearly as much volume as the Mercedes M-Class, and with its lower load height, the space in the E-Class wagon is much easier to reach than it is in an SUV. The folding third-row seat will accommodate pre-teens without complaint, but most adults won't like it back there.

Driving Impressions
All of the 2008 Mercedes E-Class cars are enjoyable to drive. Smooth, serene and quiet are the dominant impressions at the wheel of any E-Class, unless you have the accelerator floored. There's very little vibration anywhere in the cabin, and almost no wind noise. Improvements to the geometry of the front suspension for 2008 give the E-Class a crisper, quicker turn-in while cornering, perceptibly increasing the sporty nature of the car's handling. All of the E-Class cars corner responsively and provide a smooth, if slightly firm, ride, a balance we like in luxury sedans. The four-link front suspension is similar to that under the expensive S-Class models, and the five-link rear suspension does a superb job of controlling unwanted wheel movement, which is crucial to handling and ride quality. The Sport models are tuned for those who like to feel in closer touch to the pavement, as it's fitted with shorter springs for a slightly lower ride height, stiffer shocks and low-profile performance tires on 18-inch wheels. The available Airmatic Dual Control suspension replaces the standard steel coil springs with air springs. This computer-managed system adjusts the air pressure to the spring at each wheel, based on road conditions or driving style, to slightly soften or firm the ride and to add or decrease body roll (lean) in corners. In combination with electronically adjusted shock absorbers, the air suspension can automatically improve ride quality or handling or optimize the balance of the two, depending on where the car is traveling and whether the driver is cruising or driving quickly. The system works automatically, without switching suspension settings between sport and comfort. The variable-power steering system was improved for 2008 with a 10-percent quicker ratio for more precise control of front wheel direction. The system provides more boost for easy turning at low speeds and less for more progressive steering response and feedback at higher speeds. With 2.6 turns lock-to-lock compared to the previous system's 3.3 turns, we found the new steering makes maneuvering through crowded parking lots easier and more pleasant, and far more responsive in the corners. One of our gripes with the 2006 models was the braking system. All of the E-Class cars came with Sensotronic Brake Control, commonly called brake-by-wire, because the connection between the brake pedal and reservoir of brake fluid is electronic, not mechanical. Although we found them to be excellent in terms of performance, with stops straight, true and short, repeatedly, with virtually no brake fade, we didn't care for the way they engaged, which we felt was too abrupt, especially in commuter crawl mode. They do, however, have their advantages. The electronic system can apply brake force to each wheel independently, helping to keep the car traveling straight and true during panic stops, even on bumpy, uneven roads. It will also keep the brakes on full in an emergency situation, as measured by sensors, even if a driver inadvertently eases off the brake pedal. And if it's raining, the system periodically, lightly, applies the brakes to sweep them dry. Still, the brake-by-wire had its quirks. Several testers found them difficult to modulate in everyday driving, making smooth braking around town a challenge. In short, we didn't really like them. For 2008, the Sensotronic control has been removed from the brake system, which is essentially unchanged except for the now ultra-smooth grasp of the binders, even at slow speeds. Each E-Class model has progressively larger brake rotors and more complex piston designs to complement the engine's power and corresponding speed potential. The E-Class wagons give up almost nothing to the sedans in performance, fuel economy or handling dynamics. The E350 comes with a 3.5-liter engine introduced for 2006, which was the first Mercedes V6 with dual overhead cams and four valves per cylinder. The 3.5-liter V6 generates 268 hp and it matches well with the high-tech seven-speed automatic transmission that comes standard. The E350 is as responsive as any V6-powered car we've driven. The 3.5-liter V6 has fully variable valve timing, delivering an impressive amount of torque from idle all the way to redline. The E350 responds immediately, no matter how fast it's already traveling when the driver dips the gas pedal. The 3.5-liter engine is also appreciably smooth, particularly at high rpm. And thanks to the seven-speed automatic, it delivers decent fuel mileage. The new E320 Bluetec diesel gets vastly superior fuel economy, however. It's expected to deliver 27 city/37 highway mpg. With predominantly highway travel, this gives it a range of 600-700 miles per tank. The Bluetec replaces the diesel-powered E320 CDI, which was an impressive car, but the new diesel is better and cleaner. It's designed to run on the ultra-low-sulfur diesel fuel introduced into the U.S. starting October 2006. Mercedes' first V6 diesel, the Bluetec features all the latest high-tech goodies, including turbocharging, a variable nozzle turbine, four valves per cylinder, exhaust gas recirculation and a third generation of CDI, the common-rail direct-injection system that delivers fuel to the engine at an incredible 23,000 psi (compared to 100-250 psi in a typical gasoline engine). Yet the technology matters less than the results. The diesel V6 puts out a modest 208 hp, but is backed up by a resounding 400 pound-feet of torque that begins as early as 1600 rpm. In other words, this baby hauls. There's no smoke to be seen or smelled. Four after-treatment units in the exhaust stream help make the Bluetec V6 the cleanest diesel powerplant in the world. (Initially, it will be sold in 45 states only, but Mercedes-Benz expects that a further evolution of Bluetec will allow diesel Mercedes to be sold throughout the United States in 2008.) We drove the E320 Bluetec sedan through the deserts and mountains surrounding Las Vegas, and it exhibited all the attractive traits of the gasoline-powered Benzes, and more. As well as being as smooth and quiet as any of the world's luxury sedans, Bluetec comes with a powerful character all its own, owing to the massive yank of torque that pulls the car from 0 to 60 mph in just 6.6 seconds, only a tenth of a second behind the gas-powered E350 sedan. In other words, forget everything you know about diesel-powered cars built in the 1970s, '80s or '90s. Slow starting? Not anymore. Like all diesels, the E-Class version still needs electric glow plugs to heat the combustion chambers before starting, but we never noticed. Unpleasant odors? You'll still experience that oily diesel smell at the truck stop when you fill the E320 Bluetec's tank, but once the filler cap is back on and the car is running, there will be no unpleasant fumes inside or out of this E-Class. Excessive engine noise? At idle, during warm-up, we heard the rapid tick-tick of diesel noise more loudly than anything coming from the gasoline-powered E350's engine, but once underway, there was zero difference in the amount of engine noise reaching the cabin compared to other E-Class models. That extra bit of noise is more than offset by the Bluetec sedan's excellent benefits.With 400 pound-feet of torque, more even than the E550 boasts with its V8, the turbodiesel V6 makes a winner of the E320 Bluetec in almost any stoplight derby. The 3,860-pound sedan, though no lightweight, jumps forward quickly enough to spin the back tires just by jabbing the right pedal, if you've switched the traction control off. Its turbocharger also provides a level of immunity from the power-robbing effects of high elevation, as we discovered in our climb up Mount Charleston northwest of Las Vegas. And on one quiet desert road, we reached the electronically limited top speed of 130 mph without breaking a sweat. That said, there's nothing like the E550's V8 power for smooth, exhilarating acceleration. This V8 is sweet from idle to the 6000-rpm redline, and with 382 hp and 391 pound-feet of torque (up from 302 horsepower and 339 pound-feet in the E500), the E550 flies. From a stoplight or from 70 mph, there's a deep well of torque underfoot and plenty of acceleration, good enough to take it from 0 to 60 mph in 5.2 seconds. Throughout our first drive of the E550, on the high-speed autobahns of Germany and over the twisting roads of the Bavarian Alps, it provided a stellar combination of performance and luxury, sharp handling and passenger comfort. In short, the Mercedes E550 is as nearly perfect a sports sedan as has been developed by anyone. The seven-speed automatic transmission improves acceleration, performance and response, but it also enhances fuel efficiency when compared to a more common five-speed automatic. Gear changes are barely noticeable, especially in the higher gears. This transmission allows significantly quicker acceleration for highway passing situations. And it doesn't have to go through every gear: Step on the gas and the transmission will skip down to the appropriate gear, switching from seventh to fifth, for example, and from there directly to third, meaning two downshifts instead of four. Both of the transmissions also offer three individual driver-selectable shift programs to alter the shifting characteristics from comfort to sport to full manual gear selection. The 2008 E63 AMG sedan and wagon operate on another plane entirely. Their race-bred naturally aspired 6.2-liter V8, which is being offered in a variety of Mercedes models, delivers 507 hp and 465 pound-feet of torque, compared to 469 hp and 516 pound-feet of torque in the outgoing E55 AMG. The previous models got their power courtesy of an intercooled Lysholm screw-type supercharger, which helped rocket them from 0 to 60 mph in 4.5 seconds, but the new, big V8 makes the cars even faster: 4.3 seconds from 0 to 60 mph. Plus, the new V8 emits less harmful emissions than the supercharged engine and weighs 55 pounds less. The 6.2-liter V8 is the first Mercedes engine to be totally engineered and built at the AMG facility, and the firm put every bit of its long motorsports experience into it. The all-aluminum engine features four valves per cylinder, a variable intake manifold made of magnesium, variable camshafts and a special low-friction cylinder wall treatment, but the most important part is it performs and growls like a big V8. The five-speed automatic in the E55 AMG has been replaced by a more efficient seven-speed automatic with AMG-tuned Speedshift programming. Like the five-speed, it shifts quickly up or down (though without the throttle blip of some manu-matics), doesn't hunt back and forth for the right gear, even in hilly terrain, and it rarely shifts unless the driver changes the angle of the gas pedal, which is good. When the driver prefers, an auto-manual shift mechanism allows a high level of control over gear selection. Either by toggling the shifter left or right or using the paddles on the steering wheel, the transmission shifts quickly up and down at the driver's discretion. The system will hold the selected gear indefinitely just below the 6000-rpm redline, but it won't let you bump the engine off its rev-limiter without shifting up a gear. Should the mood strike, a driver can run through the gears or challenge a curving stretch of road almost as if it was a fully manual transmission. Drivers who like that sort of thing might gripe about the lack of a blipped throttle during downshifts like some other transmissions of this type deliver, but that's a minor point that will be moot to almost everyone else. Most of the time, we simply put it in Drive. Even the high-performance E63 AMG is so quiet that the driver forgets just how powerful and fast it is until the throttle is opened up.

Summary
The Mercedes-Benz E-Class offers a wide range of choices, but all have the attributes that have made them a benchmark among luxury cars. Every model delivers a combination of safety, luxury, practicality, performance, status, and cost of operation that's difficult to match. This remains an iconic car in a market segment crowded with good cars.