Cars are expensive and so is transmission repairs. Newer vehicles have higher requirements for changing the transmission oil and the type of fluids used. Just because they say they are "sealed" doesn't mean they are maintenance free. Some people would rather save a few bucks on e-liquid than buy what the manufacturer recommends. Personally, I'd rather spend a few euros more today than risk a small fortune later.
Idemitsu CVT Type N (NS-2) Transmission Fluid for Nissan - 5 Quart
16 Review
ACDelco GM Original Equipment 10-9243 Dexron VI Full Synthetic Auto Transmission Fluid - 1 qt: Top-Quality Performance for Your Vehicle
12 Review
Synthetic engine oil LIQUI MOLY Molygen New Generation 5W-40, 4 l, 4 kg, 1 piece
46 Review
Electric toothbrush Oral-B Pro 1 - 790 DUO, black
27 Review