A big step forward?

Mercedes-Benz is in the process of replacing almost all of its current-generation vehicles, including the compact cars. It’s been only a few months since the German firm unveiled the new-gen A-Class, and we saw the slightly bigger B-Class make its global debut at the 2018 Paris Motor Show.

Restyled to look sportier on the outside and more upscale on the inside, the new B-Class also shares lots of technology with bigger sedans such as the E-Class and S-Class. How does it compare to the outgoing model?



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The previous-generation B-Class borrows its design from the old A-Class, which gives it a bulky and boxy look.

The classic grille with the wider upper section and the slightly narrower lower trim was used as well. Inside the grille, the big tri-star emblem was flanked by two horizontal bars. The 2014-model-year facelift added LED headlamps, which sport the arched, thin light bar at the top. The headlamps had the swept-back design seen on other Mercs from a few years ago.

The bumper had different layouts depending on trim, with the sportier AMG Line featuring larger vents. However, because of the V-shaped design of the bumper and the fact that the engine hood ascends rather dramatically toward the windshield, the old B-Class has a rather utilitarian, minivan-inspired look.

By contrast, the new B-Class moves away from the MPV design. Sure, it’s still based on the A-Class, but the hatchback is now much more aggressive and this lends plenty of sportiness to the B-Class. Not only the grille is wider, but it also has a new design with narrow upper and lower sections and a wider center. Mercedes kept the horizontal slats on each side of the emblems, but revised them for a more modern look.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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The new headlamps make a big difference. Although they're not based on the CLS like the A-Class, they're narrower and slimmer.

Mercedes also ditches the swept-back design. Instead, they extend toward the wheel arches, yet another detail that adds sportiness to the MPV. Down below, the wide center intake and the arches side vents keep things interesting.

The new engine hood is arguably the detail that makes the biggest difference when compared to the old model. Because it’s almost flat now, it no longer makes the B-Class look like a mini MPV. Instead, it’s just a slightly boxier hatchback, which is a cool departure from the old design.

Needless to say, the B-Class now appeals to a bigger audience design-wise.


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Moving onto the sides, the old B-Class looks surprisingly fresh given its age. The MPV had a few cool features integrated into its profile, including the curved character line that runs above the side sills and then moves up to pass above the rear wheel arch. This feature is gone from the new car, which employs much simpler lines.

Again, the new B-Class looks sportier thanks to its lowered and flatter engine hood.

However, Mercedes-Benz didn’t do much to alter the shape of the cabin, so you can still tell that this is an MPV. The rear section of the roof is a tad sportier though, especially since the tailgate is no longer almost vertical.

Also, because the headlamps and taillights, which extend well into the fenders, are slimmer, the B-Class no longer feels like some sort of mini SUV. Overall, these changes also make it seem as if the revised MPV is a tad longer and lower.


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This is where the two generations are significantly different. We can notice big changes starting with the tailgate.

Not only the spoiler is a bit bigger on the new model, but the latest B-Class also has a new rear glass design that's rounded at the bottom.

The window ends in a straight line on the old model and the metal sheet below forms a very short decklid-like element.

Of course, it’s the taillights that get a lot attention, as they’re very slender on the new model. They still employ a two-element design with half on the fender and half of the tailgate, but they’re much smaller and thinner now. The old B-Class had big taillights that reminded me of the company’s big SUVs. The reverse lights were also moved to the bottom from the center position on the old car.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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The new shape of the lights enabled Mercedes to make critical changes to the design. For starters, the license plate recess is now bigger and wider toward the bottom. The line at the top acts like a bridge between the taillights. The old B-Class had a chrome strip here, but its absence gives the new MPV a cleaner and more upscale look.

Both the tailgate and the bumper now have more pronounced character lines, while the latter is more prominently defined toward the bottom.

Mercedes also redesigned the apron, which now looks sportier thanks to its diffuser-inspired styling, chrome trim, and bigger exhaust pipes.


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Built on the same underpinnings as the A-Class, the B-Class not only borrows exterior features from the hatchback, but also takes much of its interior.

The old B-Class boasts A-Class details all over the place, starting with the three, round A/C vents on the center stack and the control cluster below. The organic design of the dashboard also came from the A-Class, as did the door panels. Needless to say, despite being seven years old as of 2018, the old B-Class still looks appealing inside the cabin save for a few details like the cluttered center stack and the cheap-looking plastic surfaces.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Interior
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The new B-Class fixes that thankfully.

Based on the latest A-Class, which boasts one of the most appealing cabins in the compact market, the new B-Class looks modern, fresh, and far more upscale.

It even has a few unique features, like the single-volume dashboard with a big cutout on the passenger side. For comparison, the A-Class’ dash is split into two horizontal elements.

The center stack is much cleaner now, with only a handful of controls placed in a thin console just under the central A/C vents. Of course, this is because most controls are now accessible through the infotainment display and the instrument cluster. All surfaces look much better now, including in the base model, which no longer feels cheap. The door panels are more ergonomic too and offer a bit more space in their pockets.

Opt for a more expensive trim or pick out some of the expensive options and the B-Class becomes just as fancy as the bigger Mercs. Unlike in the old model, you’ll no longer feel like your driving an entry-level Mercedes-Benz and feel the need to upgrade to the C-Class or E-Class for that premium experience.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Interior
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As far as utility goes, the new B-Class is more practical. The old MPV was already a bit more spacious than its direct rival, the BMW 2 Series Active Tourer, at 488 liters with the rear seats up, but the new car can haul a lot more. Thanks to the ability to move the rear seats by 14 cm, capacity can now vary between 455 to 705 liters.

Fold the rear seats flat and the B-Class can swallow an impressive 1,540 liters of luggage.

That’s an extra 30 liters compared to the 2 Series Active Tourer. What’s more, you’ll be able to order a folding backrest for the front passenger seat starting 2019.


2014 Mercedes-Benz B-Class High Resolution Interior
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The old B-Class has a pretty solid technology package.

The facelift added an eight-inch infotainment display on top of the dash, as well as a rotary controller for easier operation. All systems are pre-installed for a Garmin sat-nav. However, the standard unit is a smaller seven-inch screen with less functions.

Bluetooth connection is standard for both phone and audio functions, and there’s two USB sockets and an SD card reader. The COMAND Online infotainment in the eight-inch unit includes a wifi hotspot and you can get the Mercedes Connect Me, which allows you to control some of the car’s functions via a smartphone app. The options list is rounded out by features like a 12-color ambient lighting system, and keyless entry and start.

On the safety front, the previous B-Class comes with a wide range of life-saving tech. On top of the usual airbags for front and rear passengers, it has features like Attention Assist, Collision Prevention Assist Plus, and an emergency call system. Options include active cruise control, blind spot monitor, and lane-keeping assist. EuroNCAP gave the B-Class a five-star rating for crash safety with a 97 percent score for adult occupant protection.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Interior
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The latest A-Class set a new benchmark in this segment for safety features and thankfully Mercedes transferred all of the hatchback's technology to the B-Class.

It all comes in fact from the flagship S-Class, which makes the B-Class one of the most advanced cars on the market right now.

Unlike its predecessor, the third-gen B-Class is able to drive semi-autonomously in certain situations. Fitted with a camera and radar system that anticipates trafic up to 500 meters ahead, it uses map and navigation data to adjust speed, change lanes, or bring the vehicle to a complete stop.

The Active Distance Assist Distronic system, for instance, adjusts the speed when approaching bends, junctions or roundabouts.

Active Brake Assist comes standard and it can help mitigate or prevent rear-end collisions with slower-moving, stopping or stationary vehicles ahead, as well as with crossing pedestrians or cyclists.

Passive safety features three-point seatbelts with belt tensioners and belt force limitation, airbags for the driver and front passenger, kneebag for the driver, windowbags, and sidebags. Optionally, you can buy rear sidebags.

Drivetrain and Performance

2014 Mercedes-Benz B-Class High Resolution Exterior
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The previous B-Class had an all-electric version too. It was called Electric Drive

Mercedes offered the second-generation B-Class with a big roster of gasoline and diesel engines. On the gasoline front, a 1.6-liter four-cylinder powered the entry-level B180 and B200 models. The first one generated 120 horsepower and 148 pound-feet, while the second one came with 154 horses and 184 pound-feet.

The remaining B200, B220, and B250 all had a 2.0-liter four-banger under the hood. While the B200 arrived with 181 horsepower and 221 pound-feet, the range-topping B250 delivered a more exciting 208 horses and 258 pound-feet of twist.

Mercedes also offered a natural gas version of the B200 with 154 horsepower and 199 pound-feet.

The diesel range began with the tiny 1.5-liter four-cylinder that Mercedes borrows from the Nissan-Renault alliance. A base version rated at 89 horsepower and 162 pound-feet powered by B160 CDI, while a more powerful unit with 108 horses and 192 pound-feet motivated the B180 CDI. The B200 CDI featured a 1.8-liter four-pot rated at 134 horsepower and 221 pound-feet. Finally, the B220 CDI version packed the 2.1-liter diesel with 168 horsepower and 258 pound-feet of torque.

The previous B-Class had an all-electric version too. Called Electric Drive, it featured an AC induction motor with an output of 177 horsepower and 251 pound-feet. This version was the only B-Class ever sold in the United States.

Transmission choices included six-speed manual and seven-speed dual-clutch automatic gearboxes.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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The new-generation B-Class also features both gasoline and diesel engines, but Mercedes replaced most of the old units.

For instance, both the 1.6- and 2.0-liter gas mills were discontinued. Instead, the Germans introduced a brand-new 1.33-liter four-banger with cylinder management, delta-shaped cylinder heads, and new particle filter.

The base engine delivers 136 horsepower and 148 pound-feet of torque, while the upgraded variant generates 163 horses and 184 pound-feet of twist. Obviously a significant upgrade over the old B180 and B200 models. There’s no replacement for the old 2.0-liter four-cylinder yet, but Mercedes should launch a new B250 model soon.

Moving over to diesels, the range begins with an updated version of the previous 1.5-liter four-cylinder. This engine powers the B180 CDI trim, rated at 116 horsepower and 192 pound-feet of twist, an eight-horsepower increase over the old model.

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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Both the 1.8- and 2.1-liter oil burners were discontinued to make room for a new 2.0-liter engine.

The new transverse-mounted unit features an aluminum crankcase, a stepped-bowl combustion process, and an extended exhaust after treatment with an additional underfloor SCR catalyst. Certified in accordance with the Euro 6d standard, which will become mandatory for new cars starting 2020, it’s offered in two flavors at launch.

There’s a B200 model rated at 150 horsepower and 236 pound-feet and a B220 version that generates 190 horsepower and 295 pound-feet of twist. That’s a notable upgrade from the old version powered by the 2.1-liter engine, which delivered 168 horses and 258 pound-feet.

Unlike the old B-Class, the new MPV doesn’t come with manual transmissions. The gasoline engines mate to a seven-speed dual-clutch, small diesel to a similar gearbox, while the bigger oil burner features a brand-new, eight-speed automatic.

There’s no word on a new Electric Drive model, but it’s likely that Mercedes won’t make one since the company’s electric vehicles have been moved under the new EQ sub-brand.

Final Thoughts

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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Needless to say, the new B-Class is a massive departure from the outgoing model. It’s sportier on the outside, more upscale on the inside, and features state-of-the-art technology from the company’s much more expensive cars. It’s a really unique feature to have access to an interior based on a large sedan in this class. The semi-autonomous technology taken from the S-Class adds even more value to a small vehicle that competes in a rather tiny niche. It’s pretty obvious that Mercedes aims to fully dominate the segment.

Granted, the old B-Class remains a solid option if you don’t want state-of-the-art tech and Merc’s latest engines, but the new-generation MPV brings you the best of everything you can own in this segment.

Further Reading

2018 Mercedes B-Class vs. 2019 Mercedes B-Class Exterior
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Read our full speculative review on the 2019 Mercedes-Benz B-Class.

2014 Mercedes-Benz B-Class High Resolution Exterior
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Read our full review on the 2014 Mercedes-Benz B-Class.

2018 Mercedes-Benz A-Class Exterior
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Read our full review on the 2018 Mercedes-Benz A-Class.

Ciprian Florea
Ciprian Florea
Senior Editor and Supercar Expert - ciprian@topspeed.com
Ciprian's passion for everything with four wheels (and more) started back when he was just a little boy, and the Lamborghini Countach was still the coolest car poster you could hang on your wall. Ciprian's career as a journalist began long before earning a Bachelor's degree, but it was only after graduating that his love for cars became a profession.  Read full bio
About the author

The new Mercedes-Benz B-Class puts the emphasis on sport with the Sports Tourer. It looks more dynamic than its predecessor and is more agile on the road while offering greater comfort. Its avant-garde interior makes for a unique feeling of space with the distinctive design of the instrument panel. One of the special features is a basic volume, which drops away towards the occupants and has cutouts in the area of the driver and front passenger. The intuitive user interface of the adaptive MBUX multimedia system is ground-breaking. Its strengths include brilliant graphics, "Hey Mercedes" voice control, a standard touch screen and functions such as MBUX Augmented Reality. When it comes to active safety, state-of-the-art driving assistance systems make the B-Class one of the segment leaders with functions carried over from the S-Class. In addition, the interior is now more spacious, while the engines are more efficient and cleaner. The eight-speed dual-clutch transmission makes its debut. Start of sales for the new B-Class is 3 December 2018, with delivery due to begin in February 2019. "More practical than ever, more chic than ever," is how Britta Seeger, Member of the Board of Management of Daimler AG, responsible for Mercedes-Benz Cars Sales, characterises the new B-Class. "In our portfolio of compacts, it’s the perfect vehicle for the whole family. And MBUX – the new Mercedes-Benz User Experience – provides also the B-Class with an all-new customer experience with functions that were previously the reserve of the luxury class." "The latest derivative of the new generation of compact cars from Mercedes-Benz, the B-Class writes a further punchy chapter in the success story of the dynamic Mercedes-Benz Sports Tourer," says Gorden Wagener, Chief Design Officer of Daimler AG. "With its emotional yet purist design, the new B-Class blends seamlessly into the design language of Sensual Purity." The designers’ brief was to make the new B-Class stand out visually from the world of minivans. That brief was accepted and executed, with the long wheelbase (2729 mm) with short overhangs, slightly lowered roof line and larger, 16- to 19-inch wheels making for dynamic proportions. The relatively squat, progressive front end with flowing transition from bonnet to A-pillar and on to the windscreen, along with the muscular shoulder of the body, underlines the sporty overall look. The same is true of the low-profile headlamps, the inside of which is already high-grade, detailed and precisely designed on the basic model with H7 headlamps and LED daytime running lights. When ordered with LED headlamps or higher, the B-Class comes with its own daytime running light signature in the form of a double torch. The optional MULTIBEAM LED headlamps have an especially sporty look. They allow fast, electronically controlled adjustment of the headlamps to suit the current traffic conditions. This feature from the luxury class, which made its debut in the compact segment in the new A-Class, now produces striking looks and added safety also in the new B-Class. At the back, the width of the vehicle is accentuated by two-part lamps, reflectors integrated in the bumper and a distinctive black bumper bottom section with diffuser look and chrome trim strip. The large roof spoiler, along with high-gloss black spoilers at the sides of the rear window, makes for improved aerodynamics while ensuring a sporty appearance. The cd value of the new B-Class starts at 0.24 (predecessor: 0.25). The lower roof line further contributes to a best-in-class airflow due to the smaller end face of the car. In addition, the aerodynamics engineers have reduced the wind noise thanks to extensive detail work. The benefits: a high level of alertness as well as the ability to engage in a relaxed conversation. The improved seat geometry and lower belt line make for an even more generous feeling of space than in the previous model. The driver sits 90 millimetres higher than in an A-Class, thus enjoying an especially good all-round view – also thanks to optimised cross-sections of the roof pillars, which obscure less of the surroundings. Interior design: revolution, the second
The interior of the B-Class is as avant-garde as the much-praised revolutionary interior architecture of the new A-Class, yet distinctive: while the instrument panel of the sister model is split into two horizontal basic bodies, that of the B-Class has a single basic volume, which drops away towards the occupants and has cutouts in the area of the driver and front passenger. The cutout in front of the driver houses the fully free-standing display unit, which comes in three different versions: with two 7-inch displays (17.78 cm), with one 7- and one 10.25-inch display (26 cm) and, in the Widescreen version, with two 10.25-inch displays. A head-up display is optionally available. The five round air vents feature a high-grade turbine look with finely styled air ducts, inspired by the world of aviation. In the Style equipment line, the vent surround is colour-accentuated in the depth of the vent geometry to give the impression of an afterburner. The centre console with touch-based control and input system comes with a black panel look similar to the E-Class. The ambience lighting with 64 colours and ten colour worlds, a unique selling point in this segment, allows individual adjustments, even to suit the mood. The seats offer a flatter and, therefore, more comfortable seating position as well as a larger adjustment range, which also increases the maximum headroom. There is also more space in the width: at 1456 millimetres (plus 33 mm), the front elbow width now has the dimensions of a mid-range vehicle. ENERGIZING seat kinetics: supports changes of posture
With seat climate control and multicontour seats with massage function, the new B-Class is available with optional extras that were previously reserved for vehicles from much higher segments. This opens the way to even better seating comfort. The new ENERGIZING seat kinetics is particularly good for the back. It can support orthopaedically beneficial changes of posture by regularly making minute adjustments to the angle of the seat cushion and backrest. The innovation is available for the front seats in combination with all-electric seat adjustment with memory function. Variable rear seats and optimised luggage compartment layout
The interior has been fine-tuned in many places: the improved entry aperture to the centre tunnel in the rear makes for a more accessible middle seat. The rear seat backrest comes as standard with a 40:20:40 split. Depending on version, from mid-2019 it will be possible for the rear seats to be moved by 14 centimetres and for the backrest to be folded into a steeper position to vary the capacity of the luggage compartment behind the rear seats between 455 and 705 litres. Although the capacity is roughly the same as in the previous model, the luggage compartment can be more efficiently used thanks to the improvements. With the rear seat folded down and luggage loaded to the roof, the luggage compartment, which is flat thanks to the adjustable load compartment floor, can accommodate up to 1540 litres behind the front seats. A folding backrest of the front passenger seat (optional extra, expected to be available from mid-2019) makes for an even longer loading length. An EASY-PACK tailgate is optionally available. It can be conveniently opened or closed automatically at the press of a button, even by means of a foot movement in combination with optional HANDS-FREE ACCESS. MBUX – Mercedes-Benz User Experience: unique experience
What goes for A also goes for B: the new B-Class is the second car model after the A-Class to feature the MBUX (Mercedes-Benz User Experience) multimedia system, which ushered in a new era with Mercedes me Connectivity. Its ability to learn thanks to Artificial Intelligence makes the system unique. MBUX is customisable and adapts to the user. It thus creates an emotional link between vehicle, driver and passengers. Its other strengths include touch screen control as standard as well as, depending on equipment, a high-resolution Widescreen cockpit, navigation display with Augmented Reality technology plus intelligent voice control with natural speech recognition, which is activated by saying "Hey Mercedes". The touch screen is part of the integrated MBUX touch control concept – a trio consisting of touch screen, touchpad on the centre console (optional) and touch controls on the steering wheel. MBUX is a revolution of the user experience in the car. Emotively appealing showcasing features underline the comprehensibility of the control structure and thrill through brilliant 3-D maximum-resolution graphics which are rendered, i.e. calculated and displayed, in real time. A head-up display is also available. New and improved Mercedes me connect services were launched with the new MBUX infotainment generation. These include navigation functions based on Car-to-X communication and Vehicle Tracking, which makes it easier to find the parked vehicle, as well as a notification function in the event of the parked vehicle being bumped or towed away. The Mercedes me collection of apps can be placed as an icon on the screen in a user-friendly way, and can be freely sorted on the homepage like all other main applications. In addition, online content, such as current petrol station prices, can optionally be displayed. Online updating is a simple way of allowing new content to be made available in MBUX. The new B-Class is already set up for private car sharing: Mercedes me allows the new compact car to be shared with friends and family members. Operation is simple and secure using the Mercedes me Car Sharing app. The new Mercedes me connect services On-Street Prediction, Real-Time Information and Off-Street Information can save Mercedes-Benz drivers valuable time and reduce their stress levels while at the same time cutting their fuel consumption and emissions when searching for a parking space. The real-time information is based, among other things, on Mercedes-Benz vehicles that have just left a parking space or driven past potential parking spaces. Intelligent Drive: functions from the S-Class
The new B-Class comes with driving assistance systems with cooperative driver support, thus providing one of the highest levels of active safety in this segment with functions from the S‑Class. For the first time, the B-Class is able to drive semi-autonomously in certain situations. To do so, it employs improved camera and radar systems to anticipate the traffic up to 500 metres ahead while using map and navigation data for assistance functions. For example, Active Distance Assist DISTRONIC as part of the Driving Assistance package is able to support the driver in many route-specific situations, predictively and conveniently adjusting the speed, e.g. when approaching bends, junctions or roundabouts. Also on board are Active Emergency Stop Assist and intuitively understandable Active Lane Change Assist. The new B-Class comes as standard with extended Active Brake Assist, which can help mitigate the severity of rear-end collisions with slower-moving, stopping or stationary vehicles ahead – and now even with crossing pedestrians or cyclists – or prevent them altogether. The new B-Class, too, was developed and tested at the new Vehicle Safety Technology Centre (TFS). The design of the vehicle structures with regard to geometry, material thickness, joining technique and material quality incorporates findings from real-world accidents. Many bodyshell components are made of high-strength and ultra-high-strength steel to obtain high strength with lowest possible weight, because the core of the safety design of the body is the highly stable passenger cell. Driver and front passenger are provided with three-point seat belts with pyrotechnic belt tensioners and belt force limitation. In combination with the PRE-SAFE® system (optional extra), the front seats are additionally equipped with electrically reversible belt reel tensioners. Both of the outer rear seats are fitted with a seat belt with reel tensioner and belt force limiter. The new B-Class comes as standard with airbags for driver and front passenger, kneebag for driver and windowbags and sidebags (combined thorax/pelvis bag). Rear sidebags are optionally available. Double powertrain debut: new powerful two-litre diesel is Euro 6d compliant, new eight-speed dual-clutch transmission
Compared to its predecessor, the new B-Class is in all cases powered by new, efficient engines, all of which comply with the Euro 6d-TEMP limits. Making its debut is a transverse-mounted version of the OM 654 two-litre diesel with 110 kW and 140 kW, aluminium crankcase and stepped-bowl combustion process. Thanks to extended exhaust aftertreatment with an additional underfloor SCR catalyst, the B-Class with the OM 654q is the first compact model from Mercedes-Benz to be certified in accordance with the Euro 6d standard, which will become mandatory for new models only on 1.1.2020. The large diesel represents an addition to the four-cylinder diesel (OM 608) already known from the A-Class with 1.5-litre displacement, up to 85 kW and up to 260 Nm. Also available are two four-cylinder petrol engines of the M 282 series with 1.33-litre displacement and 100 kW/120 kW. Innovations include cylinder management (in combination with 7G-DCT transmission), delta shape of the cylinder head and particle filter. The new B-Class is initially available exclusively with dual-clutch transmissions. New here is the eight-speed 8G-DCT, which is used in combination with the larger diesel engine. Other new engines will follow, as will models with 4MATIC all-wheel drive. A 43-litre tank is installed as standard, while a 51-litre tank is optionally available, depending on the engine. The following five engine variants will be available at the launch of the B-Class[1]: B 180 (100kW/136 hp, 200 Nm); with 7G-DCT dual-clutch transmission (combined fuel consumption 5.6-5.4 l/100 km, combined CO2 emissions 128-124 g/km)
B 200 (120kW/163 hp, 250 Nm); with 7G-DCT dual-clutch transmission (combined fuel consumption 5.6-5.4 l/100 km, combined CO2 emissions 129-124 g/km) B 180 d with 7G-DCT dual-clutch transmission (85kW/116 hp), 260 Nm; combined fuel consumption 4.4-4.1 l/100 km, combined CO2 emissions 115-109 g/km)
B 200 d with 8G-DCT dual-clutch transmission (110kW/150 hp), 320 Nm; combined fuel consumption 5.4-4.2 l/100 km, combined CO2 emissions 119-112 g/km)
B 220 d with 8G-DCT dual-clutch transmission (140kW/190 hp), 400 Nm; combined fuel consumption 4.5-4.4 l/100 km, combined CO2 emissions 119-116 g/km). The new OM 654q diesel engine: lighter, more powerful, cleaner
The transverse-mounted version of the latest premium diesel engine family makes its debut in the new B-Class. Despite its lower displacement – just under two litres - the around 16 percent lighter new diesel engine with 140 kW (190 hp) puts out 10 kW more than the previous engine. On the inside, the OM 654q offers efficiency-enhancing technological highlights such as steel pistons with stepped bowls in an aluminium block. The cylinder liners are coated using the further-improved NANOSLIDE® process. With a cylinder spacing of just 90 mm instead of 94 mm, the new engine is more compact than its predecessor while allowing the exhaust aftertreatment components to be installed directly on the engine, where the exhaust temperature is higher, making for more efficient aftertreatment. Thanks to further improved exhaust aftertreatment, the powerful four-cylinder from the modern OM 654 engine family already meets the Stage 2 RDE (Real Driving Emissions) standard coming into force from 2020, and is certified to Euro 6d. Even in demanding driving situations and under challenging environmental conditions, the B-Class remains within all the emissions limits. This is achieved by additional selective catalytic reduction (SCR) with an ammonia slip catalyst (ASC) in the exhaust system of the B-Class. This allows a more generous dose of the reduction agent AdBlue, as any surpluses can be reduced and converted in the second SCR. These surpluses (amonia slip) particularly occur during fast temperature changes in the exhaust tract, e.g. when moving from city traffic to the motorway. Suspension: agile and comfortable
At least as agile as its predecessor while even more comfortable – that was the development brief handed to the suspension specialists for the new B-Class. Depending on the version, several options are available for the basic configuration, including a lowered comfort suspension and a suspension with active adaptive damping, which lets the driver control the damper tuning while driving using DYNAMIC SELECT. The system uses an electronic valve, the control of which additionally analyses the driving state and optimises the damping rate individually for each wheel. In all versions of the new B-Class, the front wheels feature McPherson struts and forged-aluminium wishbones, to which are attached cast-aluminium steering knuckles. This makes the unsprung mass as low as possible in the interests of road-holding and comfort. At the rear, the models with the entry-level engine variants come with a twist-beam rear axle in the basic configuration. In combination with the more powerful engine variants or if the customer opts for one of the optional suspension systems, use is made of a sophisticated four-link rear axle, which is made extensively of aluminium to reduce the unsprung mass. The three wishbones and one trailing arm on each of the rear wheels are mounted on a subframe, which is isolated from the bodyshell by rubber bushings to reduce the transfer of vibration and noise from suspension to body. Single-tube shock absorbers and separate coil springs are used for both the four-link and the twist-beam rear axle.

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