Which series does the Mercedes-Benz 400 belong to?

[MargaretLee]

Mercedes-Benz models equipped with a 3.0T 333-horsepower V6 engine are all named 400, with the Mercedes S400 as an example. Appearance features of the Mercedes S400: In the minor facelift, Mercedes-Benz did not make many changes to the S-Class. The front end follows the brand's recent family style, featuring a larger and more sharply contoured grille. At the rear, the body-colored trim on the taillight clusters was removed and replaced with full LED light clusters, incorporating the reverse light design. This retains the original two-bar style while improving rear lighting effects. The redesigned front and rear bumpers have sharper lines, giving the S-Class a more youthful and sporty appearance. The high-brightness LED daytime running lights are exclusive to the S400 Hybrid and S600 models, highlighting the technological prowess of the hybrid system and the V12 engine. Engine of the Mercedes S400: To improve overall fuel efficiency, the S400 Hybrid's engine, like the THS, operates on the Atkinson cycle. Mercedes-Benz engineers adjusted the intake valve timing of this V6 engine, delaying its closure compared to the original S350, to achieve a compression stroke shorter than the power stroke. This leverages the Atkinson cycle principle for higher thermal efficiency. To counteract the significant power loss typical of Atkinson cycle engines, Mercedes-Benz engineers recalibrated the V6 engine in the S400 Hybrid, increasing the compression ratio from 10.7:1 to 11.7:1 and adjusting fuel injection and ignition timing. As a result, this Atkinson engine maintains the same peak torque of 35.7 kg·m as the original engine, with maximum horsepower even higher at 279 hp. The S400 Hybrid accelerates from 0 to 100 km/h in just 7.2 seconds and can reach the electronically limited top speed of 250 km/h. More impressively, thanks to the hybrid system's excellent performance, along with Start/Stop and brake energy recovery systems, it achieves over 12 km per liter of gasoline, reducing fuel consumption by 21% and CO2 emissions by 18%, making the S400 Hybrid the most fuel-efficient model in its class.