The FIA has confirmed that Mercedes will receive engine upgrades, despite protests from rival teams. This decision follows the implementation of the Additional Development and Upgrade Opportunities (ADUO) system for the 2026 season, aimed at helping manufacturers catch up to leading power units.

In June, the FIA's initial performance assessment revealed that Red Bull possessed the strongest engine, while Mercedes, Ferrari, Audi, and Honda were granted upgrades. Although the FIA did not publicly disclose their findings, details leaked, sparking controversy. Critics argued that while Mercedes had dominated the first six races, Red Bull struggled with only one podium finish.

Max Verstappen, the Red Bull driver, voiced his concerns, while Toto Wolff, Mercedes' team principal, questioned the FIA's processes, stating that his team had "the most powerful power unit."

Following a second assessment after the Hungarian Grand Prix, the FIA announced:

• Mercedes is allowed one additional homologation in both 2026 and 2027, with corresponding cost cap and dyno testing increases.
• Audi, Ferrari, and Honda will receive two additional homologations in each of those years.

However, no additional homologations were granted in the second review period, indicating that Red Bull remains competitive. Kimi Antonelli leads in the drivers' standings, with Mercedes holding an 87-point lead over Ferrari in the constructors' championship.

FIA director Nikolas Tombazis emphasized the thoroughness of the ADUO review process and acknowledged the need for confidentiality regarding team data. The third review period began during the Dutch Grand Prix, continuing until the Mexico City Grand Prix on November 1.