Can someone tell me what is usually covered in a non-Starmark 90 day "power train" warranty for a used mercedes? For example would replacement of switches and relays be covered- is the diagnosis covered? etc. the other part of this question - is a warranty only valid for a used but not Starmark Mercedes in the dealership where the vehicle was purchased. For example, if I travelled out west and purchased a vehicle, would a dealership here have to honor warranty or would the original dealer be required to reimburse for repairs. Thank you for any information.