While one car boasts outstanding driving performance and high fuel efficiency, the other offers high fuel efficiency and good handling. What is the difference between the two? The sporty handling dynamics set the tone in the all-wheel drive GLK 250 CDI 4MATIC BlueEFFICIENCY: The modern, four-cylinder diesel with 150 kW (204 hp) and an impressive 500 Nm of torque guarantees top acceleration and flexibility. In fact, this model has the most powerful four-cylinder diesel engine in the SUV world. The rear-wheel drive GLK 220 CDI BlueEFFICIENCY with the familiar 125 kW (170 hp) diesel engine, on the other hand, impresses with even better fuel economy (consumption as low as 6.0 l/100 km) while at the same time delivering great performance.

The new models underscore the leading position of the distinctive yet compact GLK. Whereas the GLK 250 CDI 4MATIC featuring permanently engaged all-wheel drive, 7G-TRONIC transmission and the segment’s most powerful four-cylinder diesel engine augments the world of top-of-the-range compact SUVs, the GLK 220 CDI with rear-wheel drive and six-speed manual transmission offers maximum fuel economy. It consumes only between 6.0 and 6.4 litres of diesel fuel per 100 kilometres and combines these low consumption values with good performance. The rear-wheel drive vehicle accelerates from zero to 100 km/h in 8.5 seconds and reaches a top speed of 205 km/h. The GLK 250 CDI4MATIC completes the sprint to the 100 km/h mark in 7.9 seconds and doesn’t stop accelerating until reaching 213 km/h. This sports car-like performance does not come at the typical cost of higher consumption. The diesel consumes only 6.7 litres per 100 kilometres on average.

GLK 250 CDI 4MATIC: The fun yet frugal power SUV

The GLK 250 CDI 4MATIC BlueEFFICIENCY brings the world’s most powerful four-cylinder diesel engine for an SUV to the Mercedes-Benz range. The new 2143 cc diesel engine with direct fuel injection produces 150 kW/204 hp and 500 Nm of torque in the GLK for outstanding performance. Just as impressive as the sprint times and the top speed is the GLK’s top-gear acceleration. Thanks to its high torque, which is already present at 1600 rpm, the GLK 250 CDI 4MATIC accelerates powerfully when overtaking, requiring only 7.0 seconds for the sprint from 80 to 120 km/h. In spite of its great performance, this GLK model is very economical to drive, consuming only 6.7 litres of diesel fuel on average per 100 kilometres (combined NEDC consumption, preliminary value). This makes the GLK significantly more fuel efficient than comparable models in this performance class. The vehicle produces CO2 emissions of 176 grams per kilometre.Furthermore, it not only meets the EU5 emissions standard but also has the potential to fulfil the EU6 limits as well as the BIN 5 requirements in the USA.

Diesel engine with advanced common-rail technology

One of the hallmarks of the new diesel engine in the GLK 250 CDI 4MATIC BlueEFFICIENCY is the increased maximum rail pressure of 2000 bar. This increase in pressure potential is a prerequisite for increasing engine output and torque while at the same time significantly reducing untreated emissions. Newly developed piezo injectors take advantage of the fact that piezoceramics change their crystal structure – and therefore their thickness – in a matter of nanoseconds (one nanosecond = one billionth of a second) when electrical voltage is applied. The new injectors are equipped with a stack of thin piezoceramic layers (called the “piezo stack”) to enable them to achieve a sufficient overall stroke from the very small stroke per layer. The injector needle is actuated directly, so that the fuel injection can be adjusted even more precisely in line with the current load and engine speed situation. Another key factor behind the low emissions, low fuel consumption at full load and peak output is the ignition pressure of 200 bars, which puts the four-cylinder diesel at the head of the field when it comes to diesel engines for passenger vehicles.

A two-stage supercharging system comprising a small high-pressure (HP) turbocharger and a large low-pressure (LP) turbocharger ensures that the optimum charging pressure is always available. The two turbochargers are connected in series, and each has a turbine and a compressor driven by this turbine for the combustion air. The HP turbine is located directly at the exhaust manifold and initially allows exhaust gas to flow through it, causing it to rotate at up to 215,000 revolutions per minute. The HP turbine housing features an integral bypass duct, which can be opened or closed by means of a wastegate triggered by a vacuum unit. If the flap is closed, the entire exhaust stream flows through the HP turbine so that the exhaust gas energy is initially available to drive the HP turbine. This allows the optimal boost pressure to be developed even at low engine speeds. As the engine speed increases, the wastegate opens, distributing the exhaust gas energy to the turbines with optimum efficiency. Downstream of the HP turbine, the two exhaust gas streams reconverge, and the remaining exhaust gas energy drives the LP turbine at a maximum speed of up to 185,000 revolutions per minute. At intermediate engine speeds, the wastegate of the HP turbine is opened so wide that the HP turbine ceases to perform any appreciable work. This allows the full exhaust gas energy to be directed with low losses into the LP turbine, which then does all of the turbine work.

The two compressors are likewise connected in series and are in addition connected to a bypass duct. The combustion air from the air filter first flows through the low-pressure compressor, where it is compressed as a function of the LP turbine’s driving power. The compressed air then flows into the high-pressure compressor, which is coupled to the HP turbine, where it undergoes further compression for a genuine two-stage supercharging process.

The key benefit of this intelligent, on-demand control is the improved cylinder charging and, consequently, high torque even at low engine speeds. What’s more, fuel consumption is reduced. During normal operation, the advantages of this concept can be seen in the harmonious driving characteristics with no turbo lag, a good torque curve across the entire engine speed range, spontaneous throttle response and noticeably improved performance. As a logical supplement to the turbocharger system, Mercedes-Benz installs a larger intercooler that reduces the temperature of the compressed and heated air by as much as 140 degrees Celsius so that a larger volume of air can enter the combustion chambers.

The newly developed exhaust gas recirculation valve (EGR valve) works like a rotary disc valve and precisely controls the quantity of fresh air and recirculated exhaust air to effectively reduce emissions of nitrogen oxides.

Sacrifice without detriment: The GLK 220 CDI BlueEFFICIENCY with rear-wheel drive and six-speed manual transmission

The powerful, yet economical four-cylinder diesel engine in the GLK 220 CDI BlueEFFICIENCY is another unit from this same generation of engines. It produces 125 kw/170 hp and, depending on the equipment level, consumes only between 6.0 and 6.4 litres of diesel fuel per 100 kilometres (combined NEDC consumption, preliminary value). CO2 emissions are from 158 to 168 grams per kilometre. Not only does it meet the current EU5 emissions standard, this version also has the potential to fulfil the EU6 limits as well as the BIN 5 requirements in the USA.

In combination with a tried and tested six-speed manual transmission and rear-wheel drive, the engine of the GLK 220 CDI BlueEFFICIENCY exudes a lot of power and responds to the driver’s commands with a great deal of agility. It boasts good pulling power and, like the more powerful variant, is extremely smooth running for a four-cylinder diesel engine. In addition to good performance, the engine generates an impressive torque at low engine speeds: Peak torque of 400 Nm is available over a wide rev range from 1400 to 2800 rpm, making it possible to drive very fuel efficiently at low engine speeds in everyday driving situations. The rear-wheel drive vehicle sprints from zero to 100 km/h in 8.5 seconds and reaches a top speed of 205 km/h.

The GLK 220 CDI BlueEFFICIENCY is also available with the 7G-TRONIC seven-speed automatic transmission as an option.

BlueEFFICIENCY: Efficient measures for reducing fuel consumption

Like all BlueEFFICIENCY models from Mercedes-Benz, the two new GLK models also feature an extensive package of measures that help to reduce fuel consumption. Measures besides the diesel engine with direct injection and the low-friction powertrain include weight savings achieved through the use of high strength and ultra high strength steels in the bodyshell and weight-optimised alloy wheels. Aerodynamic side mirrors and underbody panels lower the air resistance, and newly developed 235/60 R 17 V tyres reduce rolling resistance. A regulated fuel pump and the energy-saving electric power steering system further reduce the GLK’s fuel consumption. Thanks to a fuel-consumption computer and a display showing current fuel consumption, GLK drivers can check their fuel consumption at any time and adjust their driving behaviour accordingly.

New equipment details for the new model year

New equipment options are available for the distinctive compact SUV. These include convenience features such as KEYLESS GO or – in combination with the COMAND APS multimedia system – a reversing camera with static help lines that make it easier to manoeuvre in tight quarters. Effective immediately, all COMAND infotainment systems are able to receive digital radio (DAB). Passive safety was further improved by the standard pelvisbag*, which provide additional protection to the pelvis in the event of a collision. The crash-responsive exit assistant is a new function of the Memory equipment package that makes it easier to exit the vehicle after an accident by automatically moving the power-adjustable steering wheel to its highest position. The optional Intelligent Light System (ILS) now includes LED* daytime running lights, and 19 inch winter wheels have been added to the portfolio for the coming cold season.

Customers can choose ARTICO, a particularly robust, yet breathable synthetic leather for the interior of the GLKs.Also available is the luxurious designo line of two-colour leather appointments in black/light brown and black/corteccia.

Drivers with sporting ambitions can select EXTERIEUR*, a new AMG sports package based on the existing sports package. The scope of supply includes, in addition to the standard sports package, AMG-specific front and rear aprons with optical underbody protection in chrome, body-colour side skirts, a radiator grille with two smooth chrome louvers, a chrome rub strip and 20 inch, twin-spoke AMG alloy wheels asymmetrically shod with 235/45 R20 tyres up front and 255/40 R20 tyres in the rear.

* available from December 2009

Attractive model range: A choice of six GLK models

The GLK is a powerful and distinctive compact SUV.The striking, multi-talented vehicle sets itself apart from its competitors through its functional and appealing body shape while also combining attributes that previously were completely contradictory: Thanks to its AGILITY CONTROL chassis with variable damping, the vehicle brings together impressive handling with great driving safety and outstanding ride comfort.

The ultramodern engine line-up in all GLK models provides superlative drive comfort and compelling performance coupled with superior fuel efficiency and low emissions. Besides the two new models GLK 220 CDI BlueEFFICIENCY and GLK 250 CDI 4MATIC BlueEFFICIENCY, the vehicle is also available in four other versions: The new diesel models are supplemented by the 4MATIC version of the GLK 220 CDI BlueEFFICIENCY and the tried and tested GLK 350 CDI 4MATIC V6 diesel model. The GLK model range is rounded off by the two V6 petrol models GLK 300 4MATIC and GLK 350 4MATIC. They and the three four-cylinder diesel models meet the strict EU5 emissions standard.

All GLK models with all-wheel drive come standard with the 7G-TRONIC seven-speed automatic transmission.

Spring 2009 sees the GLK receive not only a number of new items of equipment but also a special distinction: compact and distinctive, it is the first Mercedes-Benz SUV model family to receive the sought-after Environmental Certificate in accordance with ISO standard 14062. In awarding the certificate, the independent specialists at the TÜV test organisation have once again recognised the company’s commitment to environmental protection, as also laid down in the policy guidelines for the entire Daimler Group. These require the premium manufacturer to go much further than merely considering the environmental effects which a vehicle has while it is actually in use. Instead, the entire lifecycle from development through the production process and the use phase right up to disposal is examined and optimised. The Environmental Certificate is based on a complete life cycle assessment of the GLK which comprises some 40,000 separate processes. In addition to the GLK, the A, B, C and S-Class models have already been awarded the TÜV Süd Environmental Certificate.

The certification to ISO standard 14062 applies to all GLK models. The Mercedes-Benz GLK 220 CDI BlueEFFICIENCY was used as the basis for calculating a range of parameters including the energy requirement and emissions over a distance of 200,000 kilometres. The results for the compact SUV were extremely positive: it consumed just 6.7 litres of diesel per hundred kilometres (176 g CO2/km) and performed to a higher standard than that required by the EU 5 emission limits which come into force in September 2009. Factors optimised through the BlueEFFICIENCY strategy include aerodynamics, rolling resistance, vehicle weight and energy management. What’s more, all GLK models are also compatible with future fuels. They are already designed to meet the requirements of EU plans to increase the biofuel content. A bioethanol component of 10 percent (E10) is permissible for petrol engines while diesel engines are able to run without any reservation on fuel with a 10-percent biofuel component, comprising 7 percent biodiesel (B7 FAME) and 3 percent hydrogenated vegetable oil.

Design for Environment: environmental protection starts on the drawing board

The “Design for Environment” (DfE) concept was integrated in the complex development process for the GLKright from the start. Special DfE teams made up of engineers from a wide range of disciplines – such as life cycle assessment, dismantling and recycling planning, materials and process engineering, as well as design and production – ensured compliance with the defined environmental objectives. The integration of DfE in the product development process ensured that environmental aspects were considered from the very earliest stage of development. As Dr Herbert Kohler, Chief Environmental Officer of Daimler AG, points out: “The environmental quality of a vehicle is determined by more than its fuel consumption and CO2 emissions. It’s necessary to look at the entire life cycle from development through production and use to disposal. This is a striking example of Mercedes-Benz’s comprehensive commitment to the environment. The Environmental Certificate for the GLK confirms the success of our strategy in this important area.

Public access to the Environmental Certificate and a detailed presentation of it is available in the “Life Cycle” documentation series at www.mercedes-benz.com

Comprehensive environmental concept making consistent use of secondary and renewable raw materials

The GLK already meets the requirement for a 95-percent recoverability rate which is applicable from 01.01.2015. Even at the development stage, care was taken to ensure that certain thermoplastic components – such as bumpers, wheel arch linings, side member, underbody and engine compartment panels – could be segregated and disassembled easily. In the GLK, 30 components with a total weight of 41 kilograms contain a proportion of high-grade recycled plastics. These include wheel arch linings, cable ducts and underbody panelling. As far as possible, the secondary raw materials used are obtained from vehicle-related waste flows, one example being the front wheel arch linings which are made from recycled vehicle components.

A total of 27 components with a combined weight of 20.7 kilograms are made with renewable raw materials. These components are to be found principally in the interior of the GLK. The seat upholstery contains some 15 percent pure sheep’s wool. Olive coke is used in the activated charcoal filters which prevent hydrocarbon emissions resulting from fuel evaporation and are self-regenerating during vehicle operation.

New equipment features and model designations for the GLK

A number of new items of equipment are available for the distinctive, compact SUV. These include comfort and convenience features such as KEYLESS GO or – in combination with the COMAND APS multimedia system – a reversing camera with a display showing static guide lines to assist with manoeuvring. Inside the GLK, customers can now choose particularly hard-wearing yet also breathable ARTICO man-made leather. What’s more, the luxurious designo line is also available with two-tone leather appointments in a choice of black/light brown and black/corteccia.

Spring 2009 sees the GLK model designations change in accordance with the other Mercedes-Benz model lines. The two versions with a V6 petrol engine now have the model designations “GLK 300 4MATIC (formerly GLK 280 4MATIC) and GLK 350 4MATIC (unchanged) and, like the GLK 220 CDI 4MATIC with BlueEFFICIENCY technology, meet the requirements of the EU 5 standard which comes into force in September 2009. The second diesel version, the GLK 350 CDI 4MATIC (formerly GLK 320 CDI 4MATIC), complies with the EU 4 standard.

The GLK range at a glance:

* All models feature 7G-TRONIC seven-speed automatic transmission, ** depends on equipment