The Fédération Internationale de l'Automobile (FIA) has officially confirmed that Mercedes has been permitted to introduce upgrades to its power unit, despite vocal objections from rival teams, most notably Red Bull. This decision forms 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 1 season. ADUO was designed to give manufacturers a structured pathway to close any performance gaps that may emerge during the multi‑year engine development cycle, ensuring a more level playing field as the sport evolves under tighter technical and financial regulations.
The first round of ADUO assessments took place after the opening five Grand Prix of the 2024 calendar. At that stage, the FIA’s technical panel evaluated the relative performance of each power‑unit supplier and identified which teams were lagging behind the benchmark set by the leading engine. The analysis concluded that Red Bull’s Honda‑derived power unit was the strongest overall, while Mercedes, Ferrari, Audi and Honda (the latter supplying Red Bull) fell into a performance window that justified additional development allowances. As a result, Mercedes was granted one extra homologation for the 2026 season and another for 2027, with corresponding increases to its cost‑cap allocation and dyno‑testing budget.
Audi, Ferrari and Honda were each awarded two extra homologations for both 2026 and 2027, reflecting a larger performance deficit. Although the FIA did not issue a formal press release at the time, the outcome was confirmed through a combination of leaks, team statements and driver comments.
A document that surfaced online detailed the provisional findings, and several teams publicly acknowledged the decision. The revelation sparked controversy across the paddock.
Mercedes, which had dominated the early part of the season by winning the first six races, appeared to be receiving a further advantage, while Red Bull, which had managed only a single podium finish in that span, seemed poised to lose ground despite its engine’s top‑ranked status. Red Bull’s lead driver, Max Verstappen, expressed frustration, questioning the fairness of a system that seemed to reward a team that was already ahead.
Meanwhile, Mercedes team principal Toto Wolff used the opportunity to highlight his belief that his outfit possessed "the most powerful power unit" on the grid, adding another layer of debate about the transparency and consistency of the FIA’s evaluation methods. After the second assessment period, which concluded with the Hungarian Grand Prix just before the summer hiatus, the FIA released a comprehensive statement confirming the earlier findings and adding new information. For the second period, the FIA announced that no additional homologations would be granted to any power‑unit manufacturer. This decision effectively locked in the status quo for the remainder of the season, meaning that Red Bull would not receive any extra upgrades even if other teams had improved their performance relative to the Red Bull engine.
The statement clarified that Red Bull’s power unit remained within a two‑percent performance window of the best engine on the grid, a range that the FIA deems acceptable for competitive balance. In practical terms, this means that while Mercedes and the other manufacturers have the green light to introduce their allotted upgrades, Red Bull will have to continue operating with the hardware it already possesses until the next ADUO review cycle. At the time of writing, the championship standings reflect the impact of these developments.
Mercedes driver Kimi Antonelli leads the drivers’ championship by a sizable margin, with teammate George Russell and Ferrari’s Lewis Hamilton trailing by 59 points. Max Verstappen, despite his earlier podium, finds himself 130 points behind the Italian 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 thanks to strong performances from Lando Norris, the reigning world champion, who secured victories in the two most recent races.
Mercedes has reportedly been able to implement its 2026 upgrade since the initial ADUO results were communicated in June, although the team has not yet confirmed whether the upgrade has been deployed on track. Ferrari, Audi and Honda are each believed to have introduced one of their two allocated upgrades for the 2026 season, with the second set of upgrades expected later in the year as part of the ongoing ADUO schedule. Nikolas Tombazis, the FIA’s director of single‑seater motorsport, defended the robustness of the ADUO review process.
He emphasized that the analysis was "thorough and exhaustive" and that the data quality gave the FIA a high degree of confidence in its conclusions. Tombazis also highlighted the need to protect the confidentiality and intellectual property of the teams, noting that detailed technical findings would remain private. He acknowledged that ADUO is in its inaugural year and that the framework may evolve through dialogue with all power‑unit manufacturers as the sport gains more experience with the system. The third ADUO review window began at the Dutch Grand Prix and will run through to the Mexico City Grand Prix on November 1, offering another opportunity for manufacturers to request additional upgrades if the performance data warrants it.
As the season approaches its final stretch, the stakes are high for both teams seeking to maximise their engineering advantage and for the FIA, which must balance competitive equity with the technical integrity of the sport. Fans can look forward to the upcoming Italian Grand Prix at Monza, Ferrari’s home race, scheduled for September 4‑6, where the drama surrounding engine upgrades and the championship battle is likely to intensify. The race will be broadcast live on Sky Sports F1, with streaming options available via NOW for viewers who prefer a contract‑free experience.