I mainly use Pb98. It may happen that one time I have fueled Pb95. I do not remember at this moment. I always try to avoid the "no name" gas pumps. I did a trip around the country (in total around 900km for two days). Average speed 100 - 140km / h. During the return, when I was already close to home, I accelerated to about 190km/h (the car did not want to go faster). Driving at 190km/h did not last longer than 1 maybe 2km. At this speed, I suddenly saw white smoke in the mirror. I stopped immediately.
(I also gave the turbocharger to the workshop for a rebuild, but they said it's okay.)