I just did this on my xDrive 28i (transfer case is ATC 35L) , and I got about 0.35L out by sucking everything I could thru the filler cap. This transfer case does not have the drain cap, so newTIS manual instructs you to remove the whole transfer case, flip it upside down in order to completely drain all of the fluid. That seemed like a ridiculous amount of work, so I opted for the method of sucking out.
It is preferable to remove as much as it comes out, then fill it until it starts to drip. If you want it to be better, do a few km with the car, then take it out again and fill it up. It is not worth to remove the transfer case.
Daca asta este parerea ta, nu te contrazic, important este daca vrei sa faci aceasta operatiune sa stii tu sa o faci mai bine. Multumesc pentru comentariu.
