I have a 12 C250, I feel that the combo of the small motor and the "E" trans programming is just terrible with a motor that needs RPM to develope boost. I feel the "S" program is totally acceptable. By the way this is the first Benz that I have had that the S and E programs make any difference at all. The dealer tells me that there is no way for them to change the default setting, somehow I do not believe them. I have a corvette and I can change just about any program in the engine or trans ECU's using EFI live and my laptop. Not that I would suggest I would try anything like that on my own on my MB. Can anyone help?