Red Bull is surprised by the FIA's conclusions about the best engine.

      Red Bull Racing is unpleasantly surprised by the FIA's conclusions, which state that its internal combustion engine is currently considered the benchmark in Formula 1. During the race weekend in Monaco, five power unit suppliers – Mercedes, Ferrari, Red Bull, Audi, and Honda – received a one-page document from the FIA with a preliminary assessment of the efficiency of internal combustion engines for their subsequent refinement within the ADUO program. Manufacturers whose engines fall short of the benchmark are entitled to additional investments and upgrades to reduce the gap. According to preliminary data from the FIA, the Red Bull engine turned out to be the best, as Lewis Hamilton mentioned after the race. The Mercedes engine lags behind Red Bull by more than 2%, so it will receive the right to one upgrade this year and another in 2027. The Ferrari, Audi, and Honda engines are behind the benchmark by 4% or more, so these manufacturers will be able to implement two upgrades this season and next. The ADUO only assesses the efficiency of the internal combustion engine, although approximately half of the power unit's output is provided by the electric part, which is not taken into account during these measurements. However, manufacturers who have the right to upgrades will be able to refine not only the ICE but also other elements of the power unit, such as the ERS system. Sources from the Dutch De Telegraaf confirm that Red Bull Racing is extremely dissatisfied with the FIA's conclusions. For a company that only debuted as a power unit manufacturer this season, the benchmark status means that it is currently deprived of the opportunity to make refinements. This is despite the fact that, based on the results of the first six Grands Prix, the best power unit belongs to the Mercedes team, whose drivers have won all the races this season. Red Bull hopes to receive additional clarifications from the FIA regarding the methodology and results of the assessment soon. At the time of publication, there were no comments from Milton Keynes. The FIA is also refraining from statements, as it has not yet released an official document on this matter.