The new diesel engine of the Mercedes A-Class certified NOx emissions below the limit of RDE and WLTP


The new Mercedes A-Class uses of all the technologies of the luxury models to significantly reduce emissions of oxides of nitrogen in its new diesel engine OM608

With the increasingly discussed in diesel engines and its cleanliness, the degree of compliance that can be offered on the basis of the new regulation on polluting emissions -and more especially of oxides of nitrogen – Mercedes is one of the few manufacturers that would see the demise of these mechanical options as a genuine disaster in the car industry.

Have been themselves responsible for the mark of the star that have pointed in this direction being convinced that the diesel have a future, as well as Ford follows the trail of the germans. The question depends, clearly, if you have intend to dedicate a lot of resources to get that necessary cleanup with an investment of three billion euros

, And on the part of Mercedes, yes, of course they are doing it , transferring the same technology of the big models also the new Mercedes A-Class, whose diesel engines of new generation get some average emissions of nitrogen oxide (NOx) between 40 and 60 mg/km for many thousands of kilometres of driving on the road under the conditions of the method of measurement of Emissions in real driving (RDE).


Mercedes test certification in compliance with the test procedure for light-duty vehicles are harmonised in the whole world WLTP with a more realistic consumption and emissions

figures that, according to the manufacturer, are very below the legal limit established in 168 mg/km -and even below the limit of laboratory of 80 mg/km – thanks to a compact system of post-treatment of the exhaust gases placed closer to the motor itself and that has a circuit exhaust gas recirculation with an EGR valve of the high pressure and low pressure and a converter selective reduction SCR with AdBlue.

This technology -which is equipped on the new diesel engine of four-cylinder OM 654 premiered at the E-Class and soon, in the new C200 d, and the block six-cylinder OM 656 which debuted on the flagship, the S-Class (S 400 (d)- has also moved to new diesel engine four-cylinder OM 608 that is mounted on the new Mercedes A-Class.

technical Data and Benefits Mercedes A Class 180 d 2018
Displacement 1.461 cc
Power max 116 HP at 4,000 rpm
Torque max 260 Nm between 1,750 and 2.500 rpm
max Speed 202 km/h
Acceleration 0 – 100 km/h 10,5 s
average Consumption 4,5 – 4,1 l/100 km
CO2 emissions 118 – 108 g/km

Values that depend on the diameter of the tire mounted on this mechanical version

Ola Källenius, head of development at Mercedes, explains that “At low levels of engine load, for example, while driving slowly, the effectiveness of the post-treatment of exhaust gas can be improved substantially due to the proximity of the system to the engine and the management of the temperature of the exhaust gas, significantly increasing the effectiveness of the system in the city”.


New diesel engine of four cylinders OM654 Mercedes mounted in the C-Class and E-Class

Values certified by Dekra or TÜV Hessen to perform a test with the renewed C-Class Estate equipped with the new diesel engine of four cylinders and 1.6 liters, and with the regulations RDE and WLTP currently applicable measuring NOx emissions below 10 mg/km in the cycle generally, starting cold and hot.

This reduction in the emissions of nitrogen oxides means that Mercedes is not only meets the exacting standard Euro 6c but also the Euro-6d-TEMP which will enter into force in September 2019 pointing to a change in the thrusters of the current thirty models with over 200 variants certifying its validity to this statement hardest.

at The same time, Källenius says that “there is a margin of improvement very significant” and that currently their computers already are working on stage 2 of the cycle RDE, which means to reach the target of average emissions of NOx of around 30 mg/km in the tests of the second stage in 2020 e, even go beyond and go down to 20 mg/km in the following years taking the driving tests of the RDE not only to road but also to the circulation in the urban commuting.