Originally Posted by Mr.Bimmer
My car never starts up in S3. My car always starts up in D2.
Ok, well I assumed you lived in the US, since it says Orange County, CA for your location under your name.
It sounds like you actually live in Europe or some other country and have a non-North American M3. If so, that explains why yours will not remember the D mode setting (and always starts in D2).
Also, you can in fact change the default EDC setting as explained in this thread above. What the dealership told you is incorrect.