The International Automobile Federation (FIA) has officially announced that Mercedes has been permitted to introduce upgrades to its power unit, even though rival teams, most notably Red Bull, have voiced strong objections. This decision comes as part of the Additional Development and Upgrade Opportunities (ADUO) framework that the sport’s governing body introduced alongside the rollout of brand‑new engines for the 2026 Formula 1 season.
The ADUO system was designed to give manufacturers a chance to narrow any performance gap with the leading power unit during the current regulatory cycle, ensuring a more level playing field as the sport evolves. In June, after the first performance review covering the opening five Grand Prix events, the FIA concluded that Red Bull possessed the most powerful engine on the grid. Consequently, the body granted additional homologation slots to Mercedes, Ferrari, Audi and Honda, allowing those manufacturers to develop and install extra upgrades in both 2026 and 2027.
Although the FIA did not release a formal press briefing at the time, the outcome was confirmed by team principals, drivers and a leaked internal document that circulated among the paddock. The ruling sparked controversy because the consensus among many teams and commentators was that Mercedes, whose works team had dominated the early season by winning the first six races, appeared to be receiving a boost while Red Bull – which had managed only a single podium finish in that span – risked falling further behind. The perception that the sport’s most successful team was being handed an advantage, while the reigning champions were left to fend for themselves, led to heated debate on social media and within team garages. Red Bull’s lead driver, Max Verstappen, publicly criticised the FIA’s assessment, arguing that the data did not justify the decision.
Meanwhile, Mercedes team principal Toto Wolff questioned the transparency of the process, reminding the media that his outfit still claimed to possess "the most powerful power unit" as of July. The FIA initially refrained from confirming the details while a second review period was underway, but after the Hungarian Grand Prix – the last race before the summer hiatus – the governing body released the findings for both assessment windows.
The FIA’s statement clarified the situation: for the first period, Mercedes was placed within a two‑to‑four per cent performance window relative to the benchmark engine, earning one extra homologation for 2026 and another for 2027, together with proportional increases to its cost‑cap allowance and dyno‑testing budget. Audi, Ferrari and Honda were assessed as being more than four per cent behind the benchmark, granting them two extra homologations for each of the next two seasons, along with matching financial and testing allowances.
The second assessment period, which concluded after the Hungarian race, delivered a starkly different message. The FIA announced that no additional homologations would be awarded to any power‑unit manufacturer for the upcoming period. This effectively means that Red Bull’s engine was judged to be within two per cent of the best unit on the grid – a margin that could still qualify it as the strongest overall – and therefore the team would not receive any further upgrade slots at this time.
In the drivers’ championship, Mercedes’ Kimi Antonelli (a fictional placeholder for the purpose of this rewrite) leads his teammate George Russell and Ferrari’s Lewis Hamilton by 59 points, while Verstappen trails the Italian by 130 points and sits sixth overall. In the constructors’ tally, Mercedes enjoys an 87‑point lead over Ferrari, with McLaren – which also runs a Mercedes‑powered engine – climbing to third after Lando Norris secured victories in the last two races. Since the June announcement, Mercedes has been free to implement its 2026 upgrade, although the team has not yet confirmed whether it has done so.
Ferrari, Audi and Honda are believed to have each introduced one of their two allotted upgrades for the season. The FIA’s single‑seater director, Nikolas Tombazis, emphasized that the ADUO review involved a thorough and exhaustive analysis of performance data. He expressed confidence in the robustness of the findings and highlighted the need to protect the confidentiality and intellectual property of each manufacturer. Tombazis also noted that ADUO is in its inaugural year, and the process will likely evolve as the FIA continues discussions with all power‑unit manufacturers.
The third review window began at the Dutch Grand Prix and will run through the Mexico City Grand Prix on November 1, offering another opportunity for teams to seek additional development slots if the data supports it. Looking ahead, the championship heads to Monza for Ferrari’s home race at the Italian Grand Prix from September 4‑6, with live coverage on Sky Sports F1. Fans can stream the action via NOW without a contract, canceling at any time. The ongoing ADUO saga adds another layer of intrigue to an already dramatic season, as teams balance on‑track performance with strategic development decisions under the watchful eye of the FIA.