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Core ( r / a   $\lt$  0.5) toroidal rotation from argon (Ar ^17+ , 40 AMU) and molybdenum (Mo ^32+ , 96 AMU) ions has been compared in C-Mod tokamak plasmas over a wide range of operating conditions and confinement schemes, including Ohmic L-mode in the linear and saturated regimes, ion cyclotron range of frequencies heated I-mode and H-mode, as well as in discharges with induced locked modes and with external current and rotation drive. In all cases the velocities of the two impurities are identical within about 5%, for a range between −60 and +80 km s ^−1 . This is in general agreement with the predictions of neo-classical theory.