The Fédération Internationale de l'Automobile (FIA) has officially confirmed that Mercedes is permitted to introduce upgrades to its power unit, even though rival teams, most notably Red Bull, have voiced strong objections. This decision is part of the Additional Development and Upgrade Opportunities (ADUO) framework that the governing body introduced alongside the rollout of brand‑new engines for the 2026 Formula One season. ADUO is intended to give manufacturers a structured way to narrow any performance gap with the leading power unit during the current regulatory cycle.
In June, after the first performance review covering the opening five Grand Prix events, the FIA concluded that Red Bull’s engine was the benchmark for the season. Consequently, the body authorised additional homologations for Mercedes, Ferrari, Audi and Honda, allowing each of those manufacturers to develop and install extra upgrades in the 2026 and 2027 seasons. The FIA did not release a detailed press briefing at the time; the information emerged through statements from teams and drivers, and a leaked internal document later corroborated the findings. The ruling sparked controversy across the paddock.
Mercedes, whose works team had dominated the early calendar by winning the first six races, was now granted a technical advantage, while Red Bull – whose driver line‑up had managed only a single podium finish in the same period – appeared to be at risk of falling further behind. Red Bull’s lead driver Max Verstappen publicly criticised the decision, arguing that it unfairly penalised a team that had already demonstrated superior engine performance. Meanwhile, Mercedes team principal Toto Wolff questioned the transparency of the FIA’s methodology, insisting in July that his squad possessed "the most powerful power unit" on the grid. After a second assessment period, which concluded with the Hungarian Grand Prix just before the summer hiatus, the FIA released a comprehensive statement.
For the first period, the regulator affirmed that Mercedes fell within a two‑to‑four percent performance window relative to the leading unit, thereby earning one additional homologation for 2026 and another for 2027, together with a modest increase in the associated cost‑cap and dyno‑testing allowances. Audi, Ferrari and Honda were judged to be more than four percent off the pace, granting them two extra homologations in each of the next two seasons, alongside proportionate cost‑cap adjustments. The second‑period findings delivered a further setback for Red Bull. The FIA announced that no power‑unit manufacturer would receive any extra homologations for the upcoming cycle, meaning that Red Bull, despite being the reference point, would not be awarded a catch‑up package.
In effect, the decision suggests that Red Bull’s engine remains within the two‑percent margin of the fastest unit and may still be considered the strongest overall. Had any of the other manufacturers shown a larger performance gain since June, Red Bull could have earned its own upgrade, but the data did not support that scenario. At the time of writing, the championship standings reflect Mercedes’ dominance: Kimi Antonelli leads his teammate George Russell and Ferrari’s Lewis Hamilton by 59 points, while Verstappen trails the Italian by a further 130 points in sixth place.
In the Constructors' Championship, Mercedes sit 87 points ahead of Ferrari, with McLaren – which also runs a Mercedes engine – climbing to third after Lando Norris secured victories in the two most recent races. Although Mercedes has been cleared to apply its 2026 upgrade since the June announcement, the team has not yet revealed whether it has already done so. Ferrari, Audi and Honda are believed to have each introduced one of their two allotted upgrades for the season.
FIA single‑seater director Nikolas Tombazis emphasized that the ADUO review process involved exhaustive data analysis and that the organisation is confident in the robustness of its conclusions. He also highlighted the need to protect the confidentiality and intellectual property of the teams while noting that ADUO is in its inaugural year and will likely evolve through ongoing dialogue with power‑unit manufacturers.
The third ADUO review window opened with the Dutch Grand Prix and will run through to the Mexico City Grand Prix on November 1, providing another opportunity for the FIA to assess whether further adjustments are warranted. As the season progresses toward its climax, the balance of technical advantage, regulatory oversight, and on‑track performance will continue to shape the battle for both drivers' and constructors' titles.