Since I have already bought Motul, I decided to give it a try first. There is a link here with a lot of information.
http://www.ft86club.com/forums/showthread.php?t=19218
Additionally, this website has a much more graphic illustration. It is very easy to follow.
https://howtune.com/articles/158-rep...n-a-scion-fr-s
I removed the fill and drain plugs for MTF. To my surprise, there were almost no metal shavings on the drain plug. But I made a mistake when I put the under cover back. The four bolts that secures the undercover near the engine actually have smaller heads than the rest 7. It took me a very long while to notice this and almost did this three times before I got it right. This is a very basic error and hope others won't have this problem.
The Motul bottle did make things a lot easier. I easily dumped two entire bottles into transmission. Then I poured 0.25L from a third bottle into an empty bottle. Then I dumped all of it into transmission. The Motul bottle is basically a measured bottle with a flexible spout. This makes life a lot easier. Also I noticed that when I took the fill plug off, it is absolutely clean and dry. So I am wondering one might overfill the transmission if he keeps pumping MTF until it overflows a bit. It is a lot safer with Motul bottle.
The diff drain plug did have a lot of metal shavings, which is consistent with what others have reported. According to my previous experience, I expect to see a lot less metal shavings next time. Currently I have 30k on my BRZ. The next MTF and diff gear oil change would be minimum 40k later. I cannot put 1.3L gear oil into transmission. It started to spill out at about 1.2L.
I am very tired after engine oil change, tire rotation, MTF and diff oil change. Will test it tomorrow or on Monday. This is also my 1st 30k 'maintenance package'. I feel very comfortable to put engine air filter, cabin air filter and brake fluid to some distance future.