The Fédération Internationale de l'Automobile (FIA) has officially announced that Mercedes has been authorised to implement upgrades to its power unit, despite objections raised by rival teams, most notably Red Bull Racing. This decision stems from the Additional Development and Upgrade Opportunities (ADUO) framework that the governing body introduced alongside the rollout of brand‑new engines for the 2026 Formula 1 season.
The ADUO system is intended to give manufacturers a structured pathway to close any performance gaps that emerge during the multi‑year engine development cycle, ensuring that no single power‑unit dominates the field for an extended period. In June, after the first performance review covering the opening five Grand Prix events of the season, the FIA concluded that Red Bull’s engine was the benchmark in terms of outright performance. Consequently, the body granted additional homologation slots – essentially extra chances to introduce new parts – to Mercedes, Ferrari, Audi and Honda.
While the FIA did not publish a detailed report, the outcome was confirmed indirectly through statements from team principals and drivers, and a leaked internal document later corroborated the information. The ruling sparked controversy across the paddock. Mercedes, whose works team had captured victories in each of the first six races, was perceived to be receiving a boost that could widen an already significant lead. In contrast, Red Bull, which had managed only a solitary podium finish in that same period, appeared to be at risk of falling further behind.
Max Verstappen, the Dutch driver for Red Bull, publicly criticised the decision, arguing that it unfairly penalised a team that had been working hard to improve its package. Meanwhile, Mercedes team principal Toto Wolff questioned the transparency of the FIA’s methodology, insisting that his outfit possessed "the most powerful power unit" and deserved clarity on how the assessment was carried out. After a second review period – which concluded with the Hungarian Grand Prix just before the summer hiatus – the FIA released a comprehensive statement detailing the findings for both assessment windows.
For the first period, the statement confirmed that Mercedes fell within the 2‑4 percent performance window relative to the leading engine. This placement entitled the team to one additional homologation for the 2026 season and another for 2027, along with corresponding allowances in the cost cap and dyno‑testing budget. Audi, Ferrari and Honda were judged to be more than four percent off the lead, granting them two extra homologations for each of the next two seasons, again with appropriate financial and testing leeway.
The second‑period results were less favourable for Red Bull. The FIA announced that no power‑unit manufacturer would receive further homologations for the upcoming period. This implies that, based on the data evaluated, Red Bull’s engine remained within two percent of the top‑performing unit – effectively confirming that it is still the strongest or at least tied for the strongest power unit on the grid.
Had any of the other manufacturers demonstrated a performance jump that surpassed Red Bull’s after June, the Milton Keynes‑based team could have earned its own upgrade slot, but that scenario did not materialise. Current championship standings underscore the competitive landscape shaped by these technical decisions. Mercedes driver Kimi Antonelli leads the drivers’ table, followed by teammate George Russell and Ferrari’s Lewis Hamilton, who sits 59 points behind. Max Verstappen trails by a substantial 130 points, sitting in sixth place.
In the constructors’ championship, Mercedes enjoys an 87‑point lead over Ferrari, while McLaren – which runs a Mercedes‑supplied engine – has surged into third place, buoyed by Lando Norris’s back‑to‑back victories. Although Mercedes has been cleared to deploy its 2026 upgrade since the June announcement, the team has not yet revealed whether it has already introduced the new components on track. Ferrari, Audi and Honda are believed to have each applied one of their two allotted upgrades for the current season, with the remaining upgrades reserved for later in the year.
Nikolas Tombazis, the FIA’s director of single‑seater motorsport, emphasized the rigor of the ADUO review process. He noted that the analysis conducted for the second period was "incredibly robust" and that the FIA is confident in its conclusions. He also highlighted the need to protect the confidentiality and intellectual property of the teams, which limits the amount of detail that can be publicly shared.
Tombazis acknowledged that ADUO is in its inaugural year and that the framework will evolve through ongoing dialogue with all power‑unit manufacturers. The third ADUO review window commenced with the Dutch Grand Prix and will run through to the Mexico City Grand Prix on 1 November. This period will give teams another opportunity to request upgrades if they fall outside the acceptable performance margin, ensuring that the championship remains as balanced as possible while still rewarding technical excellence.
Looking ahead, the calendar brings Formula 1 to Monza for the Italian Grand Prix, Ferrari’s home race, on 4‑6 September. Fans can follow the action live on Sky Sports F1, with streaming options available via NOW without a long‑term contract. As the season progresses, the interplay between on‑track results and off‑track technical regulations will continue to shape the narrative, with the FIA’s ADUO system playing a pivotal role in maintaining competitive parity among the sport’s elite power‑unit manufacturers.