The new Mercedes-Benz CLS on the test bench: New test cycle: The first Mercedes model certified according to WLTP/RDE

Mar 2, 2018

Between now and autumn 2018, Mercedes-Benz will gradually switch its passenger car portfolio to WLTP (Worldwide Harmonized Light Vehicles Test Procedure). The WLTP provides more realistic test results than the NEDC (New European Driving Cycle), which has been in force since 1992. The new CLS is the first Mercedes-Benz to be certified according to WLTP under the Euro 6d-TEMP emissions standard. This also verifies compliance with the limits in the so-called RDE (Real Driving Emissions) road test.

The main innovations: In contrast to the NEDC, the WLTP driving cycle takes ten minutes longer and has only 13 percent of standing time (NEDC: 23.7%). The total cycle length is around 23 kilometres – i.e. more than twice as long as the 11 kilometres of the NEDC. WLTP contains higher speeds up to 131 km/h (NEDC: 120 km/h). The average speed rises to 46 km/h (NEDC: 34 km/h), and it subjects the vehicles to greater speed variations.

The test parameters are, therefore, significantly stricter. In addition, unlike before, it is not just the basic variant of a vehicle model that is tested, but optional extras are also taken into consideration. In addition, as part of road test, the so-called RDE (Real Driving Emissions) test is used to verify that the Euro 6 limits for nitrogen oxides and particulates are not exceeded after conformity factors are taken into consideration.

Probably with effect from September 2018, the new WLTP values will be given in brochures and all other publications in Germany. The main questions concerning the WLTP are answered by Mercedes-Benz at

Environmental Certificate audit passed

The Mercedes-Benz models CLS 350 d 4MATIC (fuel consumption combined: 5.6 l/100 km; combined CO2 emissions: 148 g/km) and CLS 450 4MATIC (fuel consumption combined: 7.8 l/100 km; combined CO2 emissions: 178 g/km) have successfully completed the TÜV validation audit for the Environmental Certificate. This certificate is based on a lifecycle assessment in which the independent experts at TÜV Süd (German Technical Inspection Authority) comprehensively examine the environmental impact of the passenger car over its entire lifecycle. More details about the Environmental Certificate can be found in the documentation series "Lifecycle", which is available at

The fact that the CLS was certified according to WLTP (Euro 6d-TEMP) and for this purpose also had to complete the so-called RDE road test (Real Driving Emissions) also affects the eco-balance: the exhaust emissions of the CLS during the phase of its use were calculated based on the statutory RDE limits. Compared to earlier lifecycle assessments, driving operations therefore have a greater share of the entire lifecycle.