So, today I was in service. Even I asked them to use flush oil, they did not it, because they found out that everything is ok. During the service they changed also plugs (not needed), oil in shaft, moto oil (filled to middle between min and max), added brake fluid (maybe because they changed the rear brake pump), and added coolant.
They said that R3 can have oil consumption 0,7l/1000km. I don't trust that Triumph would release so crap to the market.
What I immediately realized after replacing the brake pump was that the motorcycle brakes significantly better and more aggressively. So if you haven't changed, definitely go!