Hot News: Mercedes S-Class Four-Cylinder

Mercedes-Benz no longer offers a six-cylinder engine on its flagship S-Class sedan in the U.S., but in Europe, the S-Class, BMW 7 Series, and Audi A8 all offer diesel and gas six-cylinder engines.

Now we're hearing rumors Mercedes might be preparing an S250 CDI BlueEfficiency model or, in other words, the first-ever four-cylinder S-Class. Such a vehicle would debut at the fast-approaching Frankfurt Motor Show and have the Mercedes' 2.1L diesel engine used in the C- and E-Class models.

Along with the S400 Hybrid, which Mercedes claims will get 29 mpg combined with its 3.5L V-6 paired to an electric motor and lithium-ion battery, the S250 CDI BlueEfficiency could make the S-Class lineup one of the more fuel-efficient in the high-end sedan segment. Expect the S250 CDI BlueEfficiency to get at least 4 mpg more when tested by U.S. standards.'

Thanks to: Motor Trend