Hello everyone, sorry for the long delay in replying, but in my area I had trouble finding a car lift to rent. But the symptom: the first gear movement was hard to engage in 1st and Reverse when cold, and it was quite quick : no symptoms after 5 minutes of driving. In the meantime, I went to Skoda because my vehicle was under warranty. They obviously reproduced the problem BUT think it's normal and won't damage the gearbox (I have serious doubts given the grinding noise in Reverse). Anyway, I bought two 1-liter bottles of Liqui Molly Top Tec MTF 5300 70W-75W and I found a lift to change it (because chains like Midas, Speedy, etc ... will never use oil not specified by Skoda). First surprise: it was very, very difficult to access the fill hole. It's at the top of the gearbox and you have to unscrew a Torx screw that holds a plastic plug. Then, you absolutely cannot add the oil without a good quality syringe with a nice long, flexible tube. The bottle's tube is too short. The filling point is NOT overflow-style, so it takes 1.1 liters, which is more than one bottle, and you can't know how much you've put in because there's no access at all when I put my finger in; there's a metal part that prevents me from reaching inside. Worse still, with spills on the ground, the syringe to fill, etc., you don't know how much you're putting in... After some calculations, I determined that I might have put in 1.25 liters instead of the 1.1 liters listed for the oil change (and 1.3 liters for a completely new or disassembled gearbox). In short, I hope I haven't damaged my gearbox because there's no oil breather like there is for engine oil. At most, there might be an air pressure relief hole, but I couldn't feel anything with my finger (and again, there was no visibility). The oil change was yesterday, and today I only started the car three times today, including once this morning. So far, there's no suspicious smell (there was a little yesterday, but that's normal with the syringe that got a bit everywhere, and the heat), and the gears shift smoothly. So I think I'll leave it as is.