The Fédération Internationale de l'Automobile (FIA) has officially announced that Mercedes will be allowed to introduce upgrades to its power unit, despite vocal objections from rival teams, most notably Red Bull Racing. This decision is part of the Additional Development and Upgrade Opportunities (ADUO) framework that the governing body introduced alongside the debut of brand‑new engines for the 2026 Formula 1 season. ADUO is intended to give manufacturers a structured pathway to narrow any performance gaps that may emerge during the multi‑year engine regulations cycle, ensuring that no single power‑unit supplier can dominate the sport unchecked.
In June, after the first performance review – which covered the opening five Grand Prix events – the FIA concluded that Red Bull’s engine was the benchmark for the season. Consequently, the body granted additional homologation slots to Mercedes, Ferrari, Audi and Honda, allowing each of those manufacturers to develop and test extra components for the 2026 and 2027 seasons. The exact details of the FIA’s assessment were not released publicly, but the outcome was corroborated by team principals, drivers and a leaked internal document that circulated within the paddock.
The decision sparked controversy because the prevailing narrative among teams and commentators was that Mercedes, whose works team had swept the first six races, was receiving a technical advantage while Red Bull – which had managed only a single podium finish in that span – appeared to be left to fend for itself. Red Bull’s lead driver, Max Verstappen, publicly criticised the ruling, suggesting that the process lacked transparency and fairness.
Meanwhile, Mercedes team principal Toto Wolff questioned the FIA’s methodology, insisting that his outfit already possessed "the most powerful power unit" on the grid. After a period of quiet while the FIA completed a second round of performance assessments – this time concluding with the Hungarian Grand Prix just before the summer hiatus – the governing body released a comprehensive statement covering both review periods. The first period’s findings confirmed the earlier leak: Mercedes fell within a two‑to‑four‑percent performance window behind the leading engine, which entitled them to one extra homologation in 2026 and another in 2027, together with proportionate increases to their cost‑cap allocation and dyno‑testing allowances. Audi, Ferrari and Honda were judged to be more than four percent off the pace, granting each of them two additional homologations for both 2026 and 2027, again with matching cost‑cap and testing adjustments.
The second‑period results delivered a further blow to Red Bull’s aspirations. The FIA stated that no additional homologations would be awarded to any power‑unit manufacturer for the next review window. This implies that Red Bull’s engine either remained within two percent of the top‑performing unit or was still considered the strongest overall, meaning the team would not receive a catch‑up upgrade. Had any of the other manufacturers demonstrated a performance surge that eclipsed Red Bull’s after the June review, the Milton Keynes‑based squad could have qualified for its own upgrade, but the data did not support that scenario.
In the championship standings, Mercedes driver Kimi Antonelli (who has been substituted for the purposes of this narrative) leads the drivers’ table by 59 points over teammate George Russell and Ferrari’s Lewis Hamilton, while Verstappen trails by 130 points from the Italian in sixth place. In the constructors’ championship, Mercedes sit 87 points clear of Ferrari, with McLaren – powered by a Mercedes engine – enjoying a resurgence thanks to back‑to‑back victories by Lando Norris, the reigning world champion. Although Mercedes received clearance to implement its 2026 upgrade as soon as the June decision was communicated, the team has not yet introduced the new parts on track. Ferrari, Audi and Honda are believed to have each rolled out one of their two allotted upgrades for the 2026 season, but the full complement of changes will likely be staged over the remainder of the year.
Nikolas Tombazis, FIA’s director of single‑seater motorsport, emphasized the rigor of the ADUO review process, noting that the analysis was "thorough and exhaustive" and that the organization has a high degree of confidence 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 disclosed publicly. Tombazis acknowledged that ADUO is in its inaugural year and that the framework may evolve as the FIA continues dialogue with all power‑unit manufacturers. The third ADUO review window commenced with the Dutch Grand Prix and will run through the Mexico City Grand Prix on 1 November, giving manufacturers another opportunity to seek performance‑enhancing upgrades before the season’s final races.
As the calendar heads toward the iconic Italian Grand Prix at Monza – Ferrari’s home event scheduled for 4‑6 September – the stakes are high for every team hoping to optimise their power‑unit packages under the new regulatory regime. In summary, the FIA’s recent statements confirm that Mercedes has earned the right to develop additional engine components for the next two seasons, while Red Bull, despite being the current performance leader, will not receive any extra homologations in the upcoming review period.
The decision underscores the delicate balance the governing body seeks to maintain between fostering competition and preserving technical fairness across the grid, a balance that will continue to be tested as the 2026 engine era unfolds.