The older Mercedes automatics have a rear pump, but how far/how fast they can be towed is still open for debate. According to my '72 250 owner's manual -
"The vehicle may be towed over short distances without jeopardizing the transmission if the selector lever is shifted to position "N" and the towing speed does not exceed 30 mph.

For towing the vehicle longer distances, or if the transmission is damaged, detach the propeller shaft from the rear axle."

Happy Motoring, Mark

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DrDKW