dwest, assuming your transmission has a drain for the torque converter, there's no need for the 'disconnect return line' method. MB made it so the pan and torque converter can be drained to get most (>85%?) of the fluid replaced with little fuss or mess. The 'disconnect return line' method is reserved for cars with no drain for the torque converter (personal recommendation).

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95 E320 Cabriolet, 169K