fmugur, teknik_ranger, FYI, I tested my transmission last year going to work (50km) and got lower temperatures than fmugur's.
Mine is a 6spd though, so may be that is the reason for the difference.

I tested it with Inpa and got a stable reading of 86°C (187°F) after driving 40 minutes. I tested it in summer and winter and got the same readings.

I did the same test this summer towing my racecar on highway with several uphills, but I can't find the data right now. If I find it, I will edit this post.

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