The Fédération Internationale de l'Automobile (FIA) has officially announced that Mercedes has been authorised to implement upgrades to its power unit, despite strong objections from rival teams, most notably Red Bull. This decision follows the introduction of a brand‑new set of engine regulations slated for the 2026 Formula One season, under which the governing body introduced an Additional Development and Upgrade Opportunities (ADUO) framework. The ADUO system was designed to give manufacturers a structured pathway to close any performance gaps that may emerge during the regulatory cycle, ensuring that no single power unit dominates the field for an extended period. In June, after the first assessment period – which covered the opening five rounds of the championship – the FIA evaluated the relative performance of each power‑unit supplier.
The analysis concluded that Red Bull's Honda‑derived engine was the benchmark, leading the FIA to grant additional homologation slots to Mercedes, Ferrari, Audi and Honda. Although the FIA did not release a detailed press briefing, the outcome was corroborated by team principals, drivers and a leaked internal document that circulated among the paddock. The ruling sparked controversy because, at the time, Mercedes had already secured victories in the first six Grand Prix events, while Red Bull had managed only a single podium finish. Many observers interpreted the upgrade allowance as a potential advantage for the German team, while Red Bull risked falling further behind.
The debate was amplified when Max Verstappen publicly criticised the decision, arguing that it undermined the spirit of fair competition. Meanwhile, Mercedes team principal Toto Wolff questioned the FIA’s methodology, insisting that his outfit already possessed "the most powerful power unit" and deserved clarity on the criteria used. After a 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 details.
For the first period, the FIA stated: "Mercedes were determined to be within the two‑to‑four per cent performance window and will therefore be allowed one additional homologation in 2026 and another in 2027, together with corresponding increases to the cost cap and dyno‑testing allowances. Audi, Ferrari and Honda were assessed as being above the four‑per‑cent threshold and will each receive two extra homologations in both 2026 and 2027, along with the associated cost‑cap and testing adjustments." The second‑period results were less favorable for Red Bull.
The FIA clarified that no further homologations would be granted to any power‑unit manufacturer for the upcoming period. This effectively means that Red Bull is judged to be operating within two per cent of the top‑performing engine, and may even still be considered the strongest unit overall. Had any of the other manufacturers demonstrated a performance jump that eclipsed Red Bull’s after the June review, the British‑based team could have earned its own upgrade slot, but the data did not support that scenario.
In the championship standings, Mercedes driver Kimi Antonelli (a fictional placeholder for illustration) leads his teammate George Russell and Ferrari’s Lewis Hamilton by 59 points at the top of the drivers' leaderboard, while Verstappen trails by a substantial 130 points, sitting in sixth place. In the constructors' championship, Mercedes enjoys an 87‑point lead over Ferrari, with McLaren – powered by a Mercedes engine – climbing to third after Lando Norris secured back‑to‑back victories in the most recent races.
Although Mercedes has been cleared to utilise its 2026 upgrade since the June announcement, the team has not yet deployed the new parts on track. Ferrari, Audi and Honda are believed to have each introduced one of their two allotted upgrades for the upcoming season, with the second set pending further assessment.
FIA single‑seater director Nikolas Tombazis emphasized the robustness of the ADUO analysis, stating that the data quality and methodological rigor give the organisation a high degree of confidence in its conclusions. He also highlighted the need to protect the confidentiality and intellectual property of the teams, noting that the ADUO process is in its inaugural year and will likely evolve through ongoing dialogue with the power‑unit manufacturers.
The third ADUO review window commenced at the Dutch Grand Prix and will run until the Mexico City Grand Prix on 1 November, offering another opportunity for manufacturers to request additional upgrades if they can demonstrate a measurable performance deficit. As the season progresses toward its climax, the stakes are high for all parties involved. Formula 1 will head to Monza for Ferrari’s home Grand Prix on 4‑6 September, a race that traditionally provides a boost for the Italian marque and its engine partner. Fans can follow the action live on Sky Sports F1, with streaming options available via NOW without a long‑term contract.
Overall, the FIA’s ADUO system represents a proactive attempt to maintain competitive balance in a sport where technical innovation can quickly create disparities. While the decision to grant Mercedes an upgrade has drawn ire from Red Bull and its supporters, the governing body maintains that the process is data‑driven and transparent, albeit confidential in its specifics. As the next assessment period unfolds, all manufacturers will be watching closely, aware that any performance shortfall could translate into a crucial upgrade opportunity that might reshape the championship battle in the final races of the year.