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Large stretches of the German Autobahn network do not feature any speed limit except a recommended 130 km/h (81 mph). Driving at rather high speeds for extended periods tends to result in increased strain on a vehicle and requires careful engineering. Mercedes-Benz has sought to engineer its vehicles, most notably the S-Class, to excel in this unique environment, allowing high speed cruising. Specific standards of engine performance, body integrity, and reliability are part of this process. For instance, the S-Class is built with an electronically limited top speed of 250 km/h (155 mph), which drivers can maintain when driving on the autobahn. AMG Manufaktur also offers delimitation or reset to 300 km/h (186 mph). Historically, the engineering of the S-Class has often occurred without regard to cost, a practice which continued unfettered up through the W140 line. The company in turn has been able to exploit this as a marketing tool, culminating in its onetime slogan, "engineered like no other car in the world." This slogan was used throughout the 1980s with the marketing of the W126 S-Class.
However, following the formation of DaimlerChrysler and the cessation of engineer-sanctioned overbudgeting in the late 1990s, this slogan was dropped; the subsequent W220 model S-Class also exhibited lower reliability and quality rates.

http://en.wikipedia.org/wiki/Mercedes-Benz_S-Class