Why don't they change the transmission oil?

my friends triptronic gear car is at 140,000 km and the vehicle sometimes sticks during the gear shifting i did not know that i had bought the vehicle in 130,000 1. i had a trip to the peugeot, i had 3 different places to change the transmission oil I couldn't make any sense, does this oil change? Or does it not change? I would appreciate if you help me thank you ...

Adayan peugeot Nizam say to the master a show.

I thoroughly researched that in the vehicle's manual, check the oil level at 60000 km. In the service manual, the gearbox oil is lifetime.

I don't know where to check the automatic transmission gearbox oil :(

your gearbox had a bar in there but I don't know exactly where

I have 307 sw triptonics recently, I went to the service .... I asked the gearbox oil..they say that an oil such as 3 lt. They said price, I did not ask for labor ... but I am thinking of changing it ....

My teacher, I changed it in the service. They get 100 l ira.