The S-Class comes with a wide choice of engines. However, the latest model, our S 350 BlueTEC, is fitted with one of the cleanest diesel engines seen in a car this size. The three-litre lump outputs 164g of carbon dioxide per kilometre, which is impressive for such a large vehicle. The BMW 730d SE, for reference, outputs CO2 at a rate of 178g/km.
The S350 L BlueTEC claims to reduce other types of harmful emissions, too. It’s fitted with Merc’s adBlue exhaust gas cleaning system. After exhaust gases are cleaned by the catalytic convertor and diesel particulate filter, adBlue liquid is injected into the exhaust stream to produce ammonia. This ammonia breaks down the harmful nitrogen oxide into nitrogen and water vapour — gases that occur naturally in the air. According to Mercedes, this reduces nitrogen oxide emissions by up to 80 per cent.
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