Mercedes S400 Hybrid Preview

The current edition of the Mercedes-Benz S-Class flagship sedan made its appearance as a 2007 model, and underwent a mild nip and tuck facelift for 2010. As part of the refresh, the German automaker also debuted its first gasoline-electric hybrid, the S400 Hybrid. As the world’s first mass-production automobile to employ a lithium-ion battery (the Tesla Roadster is a low-production vehicle), the S400 Hybrid is considered a milestone. And, rather than costing thousands more than its conventionally powered cousin, the S550, it costs thousands less. In fact, with a base price starting at $91,850, the S400 Hybrid is the least expensive S-Class model in the lineup.
2012 Mercedes-Benz S400 Hybrid
Mercedes S-Class is renowned for its powerful engines; from the S550’s 429 horsepower V8 and culminating with the S65 AMG featuring the AMG-tuned V12 that produces an outrageous 621 horsepower. But instead of adding electric power to boost the output of a V8, the decision was made to offer a hybrid that would appeal to a more discerning driver: one that seeks a more eco-conscious way of traveling in luxury.
2012 Mercedes-Benz S400 Hybrid
Developed jointly with BMW, the S400’s hybrid system is a “mild” hybrid similar to Honda’s Integrated Motor Assist hybrid powertrain, meaning it cannot be driven on electrical power alone. The 275 horsepower V6 gasoline engine is similar to the 3.5 liter used in other Mercedes cars and SUVs, but this version has different cylinder heads and pistons and a modified camshaft. It also uses a more efficient combustion strategy known as the Atkinson cycle, a common hybrid approach. The downside of the Atkinson cycle is diminished engine torque, especially at low rpm.

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