I've seen S550's at the track enter limp mode because of excess temperature, either oil, coolant, or both. I've also read post here about S550 limp mode. I have never experienced it or heard of S197's doing this. I personally have seen 260-270*F oil temp measured at the pan and 220+* F coolant temp using OBD data. No I am not concerned with my temps. Is this limp mode phenomenon a S550 exclusive problem???