Clean, extremely economical and top performers: the Mercedes-Benz Viano is equipped with the new generation of diesel engines from Mercedes-Benz. Hundreds of thousands of these engines have already proven their worth in diverse Mercedes-Benz passenger cars and in the Mercedes-Benz Sprinter van. The new Viano leads the way in environmental friendliness, with all engines meeting the Euro 5 emissions standard. Markedly reduced fuel consumption also lowers CO2 emissions to an exemplary minimal level. The BlueEFFICIENCY technology which features as standard plays a special role here. This innovative package is not to be found in any other large-capacity vehicle.

All diesel engines are equipped with an oxidation catalytic converter, a particulate filter and cooled exhaust gas recirculation. The new ECO Gear manual transmission offers a broad gear ratio spread for optimum performance and enables low fuel consumption and emission levels. The overall result is impressive response and acceleration combined with outstanding environmental friendliness, smooth running and economy. Top of the range is the V6 in the Viano CDI 3.0, which combines smooth running with impressive output and high tractive power. The latest version of this engine is also more powerful, more economical and more environmentally friendly.

At the core of the new generation of engines is the four-cylinder in-line unit which has the internal code OM 651. It is available in two power variants for the Mercedes-Benz Viano:

This represents a marked increase in power output and torque in comparison to the predecessor models. At the same time, fuel consumption and CO₂ emissions have been reduced substantially – by up to 15 percent, depending on the engine variant. Apart from attaining surprisingly good values in absolute terms for its size and weight, the Viano clearly leads its class in terms of fuel economy and CO₂ emissions.

State-of-the-art engine technology provides the basis for the Viano's exceptionally low fuel consumption and CO₂ emissions. The high torque of the long-stroke engine with 83 mm bore and a stroke of 99 mm provides for unusually high tractive power. The two overhead camshafts actuate a total of 16 inlet and exhaust valves via cam followers with hydraulic valve clearance compensation. The camshafts are driven via a combination of gearwheels and a short chain, providing the robust basis for a virtually endless service life.

Fuel injection takes place by means of a common rail system. Particularly durable solenoid valves and seven-hole injection nozzles provide for extremely precise fuel injection, with up to four injections per combustion cycle. The benefits of this technology include a gentle build-up of pressure and a smooth-running engine. The maximum injection pressure stands at an impressive 1800 bar.

Charging is carried out in both power variants by a turbocharger with variable turbine geometry which combines high efficiency with swift response to movements of the accelerator pedal. Maximum torque is available right from very low engine speeds and over a broad rev range. Thanks to its combination of a rated engine speed of 3800 rpm and astounding elasticity, the four-cylinder engine has an unusually broad useful operating range between around 1000 and 4000 revs. This is unmatched by any other diesel engine in this class of vehicle.

Common rail injection, the low-vibration forged crankshaft running on five bearings and the rear camshaft drive provide the foundation for surprisingly smooth-running engines. All four-cylinder engines also benefit from Lanchester balancing, with two counter-rotating shafts running under the crankcase driven by spur gears. Mercedes-Benz is the only manufacturer in this vehicle class to deploy balancer shafts in all four-cylinder engines of its large-capacity vehicles.

The development engineers have also devoted great attention to optimising the auxiliary units. The oil pump is a controlled vane-type pump featuring electrical actuation, for example. It controls its delivery rate automatically according to the given requirements. This reduces the power output, thereby lowering fuel consumption. The coolant pump also adjusts automatically to the given requirements, further helping to reduce fuel consumption.

The new ECO Gear six-speed manual transmission comes as standard for the Viano CDI 2.0 and CDI 2.2. This transmission is a substantial contributory factor to the reduced fuel consumption and further enhanced dynamic performance of the Viano CDI with four-cylinder engine. Its defining feature is a particularly broad gear ratio spread, with a short first gear (i=5.076) and a long sixth gear (i=0.675) designed to keep the engine speed low.

This configuration accords due consideration both to typical situations such as hill starts with a horse or boat trailer and to long journeys on the motorway. Overall, the engine speed has been reduced substantially in the interests of lower fuel consumption and emissions. Another consequence of this strategy is a noticeable improvement in ride comfort.

The particularly user-friendly and well-proven five-speed automatic transmission is alternatively available as an option for the Viano CDI 2.0 and Viano CDI 2.2. It comes as standard for the Viano 3.0 CDI and Viano 3.5.

V6 CDI: an impressive feat of engineering goes one better

The V6 engine in the Viano 3.0 CDI is an accomplished feat of engineering and a pinnacle of engine design from Mercedes-Benz. The only six-cylinder engine to be deployed in a large-capacity vehicle attains impressive performance data for a diesel in this class, providing the basis for a special driving experience. The engine is based on an aluminium crankcase with a V angle of 72 degrees. Thanks to offset connecting rod journals, the engine runs more smoothly than any other diesel in its class. The technical highlights include a total of four chain-driven overhead camshafts, common rail injection with piezo injectors and eight injection holes per injector for ultra-fine atomisation of the fuel.

The latest version of the engine in the Viano CDI 3.0 offers ten percent more power, at 165 kW (224 hp), and a highly impressive level of torque, at 440 Nm. It complies with the Euro 5 emissions standard. At the same time, fuel consumption and CO2 emissions have fallen noticeably, by around five percent, and are surprisingly low in relation to the performance capabilities of the Viano CDI 3.0. Other enhancements of this latest version of the V6 include a maximum injection pressure of 1800 bar. Key data:

Its impressive performance data, its unmatched smooth running and its admirably low fuel consumption and emission levels make the new generation of the Viano CDI 3.0 a unique contender in its class which meets the very highest standards. The engine comes exclusively with a well-proven and particularly user-friendly automatic transmission.

Viano 3.5: in a class of its own

The Viano 3.5 with its V6 petrol engine is also in a class of its own. The power delivery and smooth running of this six-cylinder engine are unmatched in any other large-capacity vehicle. The latest version of the Viano 3.5 complies with the Euro 5/l emissions standard. This engine also employs an automatic transmission. Key data:

First announced by reference to a study at the 2008 Frankfurt International Motor Show, the vision of BlueEFFICIENCY technology has now become reality, reducing fuel consumption and emissions in the Mercedes-Benz Viano. It features on board every Viano as standard, as confirmed by a label below the A-pillar. The scope of the package is unique in the class of large-capacity vehicles: ECO start/stop function (not for automatic transmissions), battery management, tyres optimised for minimum rolling resistance, ECO power steering pump, shift point indicator (not for automatic transmissions), a controlled fuel pump and internal engine measures demonstrate the cutting-edge technology involved.

The BlueEFFICIENCY package which features as standard combines sustainability and economy in exemplary fashion. It further reduces the Viano's traditionally low fuel consumption by an additional 0.2-0.3 litres per 100 km (6.6 g of CO₂ per km) in the new generation, according to model and engine variant.

Long maintenance intervals also contribute to the Viano's sustainability and economy. The Assyst service computer which comes as standard calculates the oil-change intervals on a flexible basis according to the actual use of the vehicle. The average interval across all engines stands at 30,000 km or two years. Higher mileages are also possible between oil changes, depending on the intensity of use and the individual driving style.

The Viano 4MATIC with permanent all-wheel drive and variable power distribution by means of the 4ETS traction system also benefits from numerous innovations. A new bearing for the front-axle transmission and an increased oil volume reduce wear on the all-wheel drive. Helical gearing for the differential provides for smoother running. As previously, the Viano 4Matic is available exclusively in conjunction with the two power variants of the four-cylinder engine and automatic transmission (Viano CDI 2.0/2.2 4MATIC). The Viano 4MATIC now also complies with the Euro 5 emissions standard.