The 8-speed Automatic Transmission Steptronic sets a new benchmark in terms of dynamic performance and efficiency and is a key element of BMW Efficient-Dynamics. The particularly finely tuned gradation of the gears allows optimum power delivery – from low through to high speeds. This reduces fuel consumption significantly, while enabling the driver to enjoy even more sporty flair and dynamic performance. At high speeds in particular, the additional gears reduce engine speed and therefore both fuel consumption and engine noise. The converter clutch is a contributing factor here, even if it is changed into manual shift mode. In combination with the fast engine speed transitions(optional for the BMW 428i) and the precise transmission tuning, it provides a very high level of shift comfort and reduces noise considerably.