I don't know where you guys are that the Mercedes dealerships won't touch your cars; Feldmann Imports in Bloomington, MN was ever so eager to work on mine. Even went so far as to diagnose what was wrong when my cars locking system gave up the ghost and didn't even charge me to bring the part in when Bloomington Chrysler couldn't figure out the part number. LOL

As far as being able to turn the traction control all the way off, A guy in my building has a brand new Chalanger SRT8 and guess what, it's pretty much like our cars; You can turn it off but as soon as it get s sideways, all bets are off.