SnowCub

My 2013 S350 has a Mercedes of America extended warranty for Diesel emissions and all the dealers that I have been to give me grief and arguments about what it actually covers. Anyone know a decent one that I can try? Already have dealt with
Mercedes Burlington, MA
Mercedes Natick, MA
Mercedes Haverhill, MA

Mercedes Westwood is off the table too since they destroyed my R350 forcing me to buy a new car.