go to Mercedes and get 5 qts of 722.6 trans fluid for a flush, for a full fill from empty you would be in the 12 qt range with the converter

we also have the fluid, filter, gasket, seal, clip and dipstick combo on our website, I think I only have it listed for the srt6 but it will be the same for the limited and base models

the only other fluid to get would be directly from shell, I would not recommend getting fluid from anywhere else