S-Class

The Mercedes-Benz S-Class is a series of luxury sedans produced by Mercedes-Benz, a division of Daimler AG. The classification was officially introduced in 1972 with the W116 S-Class, which succeeded previous Mercedes-Benz models dating to the mid-1950s. As the flagship of the Mercedes-Benz lineup, the S-Class has debuted many of the company's latest innovations, including drivetrain technologies, interior features, and safety systems (such as the first seatbelt pretensioners). The S-Class has ranked as the world's best-selling luxury flagship sedan, and its latest generation, the W221 S-Class, premiered in 2006 as an all-new design. As in previous iterations, the W221 S-Class is sold in standard- and long-wheelbase versions; V6, V8, V12, diesel and hybrid powertrains are offered. All models built in Mexico or sold in the United States are only available in long wheelbase.
The name "S-Class" derives from the German word "Sonderklasse" of which "S-Class" is an abbreviation. Sonderklasse means "special class" (or rather: "In a class of its own"), and in automotive terms thus refers to "a specially outfitted car." Although used colloquially for decades, following its official application in 1972, five generations of officially named S-Class sedans have been produced. Past two-door coupe models of the S-Class were known as SEC and later S-Coupe. In 1998 the S class coupe was spun off in a separate line as the CL-Class, however it will be re-designated as the S-Coupe for the 2013 model year.

In early Mercedes-Benz history, the "S-Class" designation was used colloquially, referring to the letter "S" which designated most of the larger six-cylinder powered vehicles in the company's lineup (but not the luxurious V8-powered 600 limousine). In typical Mercedes-Benz fashion introduced in the late 1920s, the traditional designation of each car consisted of three numbers indicating engine size (up to 770 in the 1930s), and optional letters indicating either engine features ("260D" since the first Diesel of 1936) or body styles ("K" for kompressor (typically a Roots compressor). In 1930, Mercedes-Benz names further added secondary engine displacement labels, e.g. "190E 2.6", to distinguish it from the mid-sized 260E, the mid-size five-door 260TE, and the "S-Class" 260SE using the same six-cylinder.
In 1993, when the W202 was introduced as C-Class, the traditional naming convention (numbers, plus letters) was reversed, with a leading letter identifying the line (currently, A, B, C, CL, CLS, E, G, GL, GLK, ML, R, S, SL, SLK are in use). From then on, the long-wheelbase models (formerly "SEL") and the regular-length models (formerly "SE") are both labeled with the prefix of "S" regardless of length. For example, both 500SE and 500SEL are now labeled as S500/S500L, with fuel injection being standard by now anyway. The W221 S-Class has been available in four trim levels; the numbers are given in ascending order to denote more upscale models (e.g. S550(S500 for US)/S600/S63 AMG/S65 AMG etc.) In official Mercedes-Benz publications and on vehicle nameplates, a space between the letter and numbers is customary (e.g. S 600).

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