if i drain through that tranny pan plug first, you said i would lose 3.5-4L opening the tranny pan.
Before I begin, I am sure you are correct but I wanted to verify as I didnt buy enough oil to replace it all nor do I think I should.

FYI, I am replacing the conductor plate in this removal of the pan.

what are the torque specs for the tranny oil pan torx bolts?

is there any way to do the ETC/ECU code clear withou the MB dealer, mine is far away and at 30mph, almost all highway, not enjoyable.

You cannot clear trans OR transfer case codes w/o special MB scanner.

MB suggests 10-12 Nm torque on the pan bolts.

IF the converter isn't drained you should lose 4L of fluid, but if the valve body comes off you will lose at least another 1/2 liter.

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thanks!