s means "standard" or "stick"
its auto stick. just like a manual/stick shift car. you have upto 5 speed. 1,2,3,4,5. to give you more power when you need to sky rocket.
but you dont need a clutch to balance the running engine or shifts gears. german technology man. i tell you
nice car by the way. but i like the o3, 3 series better.