Dear "Thoras" and "Moras".
Pls let "Halmassa" to explain a little thing. "Halmassa" has townace cr27 with auto gear box. which he brought as reconditioned vehicle in1995. Those days there were no oil changers and "Halmassa" has to do it himself.This is how he did it and other than that he did the step five of Rumesh88 's method in 40k km intervals.
Last year "Halmassa" did a overhaul to the engine and with that he replaced the gear box as a future investment.
gearbox has done 350k km and not a single repair done on it.That's why "Halmassa" tried to share it with fellow "Halmassas"!!!
Now pls don't try to say this is ok with old type boxes and can't be done with new electronic boxes. We are talking about quality of the oil and not the box it used.
I am totally agreed with the Rumesh88's method and it is very good. Infact I tried it those days, only problem with that is it's very difficult to pour the oil to the box with the same amount which is going out. and another thing removing the drain plug 3 times is easier than removing oil lines to the cooler.