| your 328 doesn't have step tronic. It has the 5 speed auto tranny with the a/m modes. When your in default (A) mode, and you put it in the 3 position, it is for the "sport" mode, because it allows you to rev higher before you upshift, so basically if you're racing, or just want a tad bit more power, put it in 3 to take off.
If you are for example in icy/snowy conditions, u can push the M mode and put it in like 2, so i starts out in 2nd gear so you try not to get as much wheel slip, etc...
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