The two GLS diesel models are powered by the OM 656, the straight­ six engine from the current engine family. It is available in two output levels, as the GLS 350 d 4MATIC with 210 kW (286 hp) and 600 Nm and as the GLS 400 d 4MATIC with 243 kW (330 hp) and 700 Nm of torque. In both versions, the powerful engine even in demanding driving conditions already complies with the Euro 6d- standard (RDE/Real Driving Emissions Stage 2), which does not come into force until 1 January 2020 for new models and one year later for all vehicles.

This is achieved with, among other things, an additional selective catalytic reduction (SCR) converter with an ammonia slip catalyst (ASC) in the exhaust tract of the GLS. This allows dosing of the AdBlue® reducing agent that is even more closely aligned with the individual driving characteristics because any excessive ammonia surplus in the second SCR converter is broken down further. The AdBlue® tank has a capacity of 31.6 liters. As before, refilling is convenient via a separate pipe behind the fuel filler flap.

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