My story on transmission fluid is that I have a friend who took his mercedes diesel to walmart to have the transmission serviced. They drained the fluid and then decided that the transmission did not have a way to refill it so they handed it back to him without saying anything. Apparently they could not get dip stick/filler off.

After a couple of blocks the transmission quit transmitting.

He eventually got them to get him a new unit.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.