Since I really had to change the pressure tank for Lupo 3l, it was a bit of hydraulic oil. I then got a bit of hydraulic oil refilled by FEBI. Link : https://www.autodoc.se/febi-bilstein/788020 That was about 3-4 months ago, since then my Lupo always shuts down on the highway. At outside temperatures under 20 degrees I can easily drive 100 km/h before the engine shuts down and the car just continues rolling. At temperatures from 25 degrees I can only drive max. 80. Slimm it will be from 30 degrees and above, I can then drive a maximum of 60 -70. If I drive too hard over a street boomer anyway, then since the summer semester I often ride on the highway, and now it has been really warm to do the same thing in the first months, because the outside temperature was under 15 degrees clear and I was driving anyway only in the city traffic, but since I have been busy driving on the highway, and since I was living in Sweden it has been a lot of trouble.