The new twin turbocharged 4.6-litre and 5.5-litre V8s for the S500 and S63 AMG models. On the standard chassis the 3.0-litre V6 diesel and 3.5-litre V6 petrol have been overhauled for increased performance and leaner fuel consumption. That's positive news for the 81.5 per cent of drivers who currently opt for the diesel model in Europe, but it's arguably the petrol V6 that warrants the most attention. Despite a power increase of 12 per cent and a rise in torque from the already gutsy V6 unit by 5.7 per cent, fuel consumption for the new engine has dropped by a hugely impressive 24 per cent. Mercedes' figures suggest combined fuel economy of 37.1mpg — a little more than four mpg behind that of the revised diesel model.
Mercedes' 7G-Tronic automatic transmission adapts shift-points to maximise economy and the Blue Efficiency moniker indicates an optimised water pump, on demand oil pump and intelligent alternator — all of which limit the strain on the engine.
The S350 Bluetec diesel could hardly be accused of lacking refinement, but the V6 petrol makes the most of its naturally balanced format to offer amazingly silky running. Mercedes has reduced the angle of the V from 90 to 60 degrees, allowing it to do away with a balancer shaft, and that natural running refinement translates into smooth power delivery. With no turbos in the equation, the V6 builds revs steadily with power and torque available in strong measure across all revs
Specs & ratings
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* Model: S350 Blue Efficiency
* Engine: 3.5-litre V6
* Transmission Seven-speed: auto RWD
* Max power: 302bhp @ 6,500rpm
* Max torque: 370Nm @ 3,500rpm
* Top speed: 250kph limited
* 0-100kph: 6.9sec
Tags:- Merc, Mercedes, Benz, S350, BE, Blue Efficiency, S class, mileage, economic, fuel efficiency
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