Mercedes team principal Toto Wolff has publicly appealed to the FIA to guarantee that the new regulations permitting power‑unit manufacturers to develop their engines throughout the 2026 season do not upset the established order of competition in Formula 1. The 2026 technical package introduces a performance‑balancing provision designed to give teams that fall behind the leading engine supplier a chance to close the gap. Under this scheme, three distinct windows of Additional Development and Upgrade Opportunities (ADUO) will be opened during the year.
Any manufacturer whose internal‑combustion engine is judged to be at least two percent slower than the benchmark power unit will be awarded the right to introduce upgrades during those windows. The governing body is expected to clarify how the ADUO framework will be applied before the next race weekend in Miami, a venue where Mercedes will arrive with a clear lead after winning the first three Grands Prix.
Wolff explained earlier in the week that the intent behind ADUO is to allow teams that are lagging in power‑unit performance to catch up, not to enable them to overtake the frontrunners in a single step. "The principle of the ADUO was to allow teams that were on the back foot in terms of the power unit to catch up, but not to leapfrog," he said.
He stressed that any decision to grant an upgrade must be made with absolute precision, transparency and a full awareness of its potential impact on the championship picture. "Gamesmanship has no place here," Wolff added, urging the FIA to act in the right spirit and to keep the competitive balance intact. Mercedes’ own power unit, built in-house, has set the performance benchmark this season, making it the likely reference point for any ADUO allocations.
While Wolff acknowledged that Honda, which supplies only Aston Martin, appears to be the only manufacturer in genuine need of assistance, he warned against any move that could reshape the current pecking order. "There’s one engine manufacturer that has a problem and we need to help.
The others are pretty much in the same ballpark," he observed, adding that he would be "very surprised, actually, and disappointed" if ADUO decisions caused a reshuffle of the standings. Mercedes not only runs its own works engine but also supplies customer power units to McLaren, Alpine and Williams. Ferrari, another works team, provides engines to Haas and the newly‑entered Cadillac, while Red Bull has debuted its own power unit and supplies its junior outfit, Racing Bulls. Audi, meanwhile, is a works team without any customer teams.
The diversity of engine supply arrangements means that the FIA’s ADUO decisions could affect a wide swath of the grid. Ferrari, Mercedes’ closest rival in the opening rounds, has welcomed the ADUO concept as an opportunity to narrow the gap to the "Silver Arrows." Team boss Fred Vasseur has spoken openly about using the extra development windows to improve the Italian squad’s power‑unit performance. When asked whether a Ferrari‑granted ADUO might force Mercedes into a chase later in the season, Wolff replied that he was not "worried" but was closely monitoring the process. He emphasized that Mercedes has detailed analytics on both its own engine output and that of its competitors, and he trusts that the FIA will base its decisions on the same data.
"I would very much hope that they continue to see themselves as protecting the integrity of the sport," Wolff said. "Because you don't want to allow an ADUO to a team that suddenly leapfrogs someone. The ADUO was always meant as a catch‑up mechanism and not as a leapfrog mechanism." The upcoming Miami Grand Prix, scheduled for May 1‑3, will be the season's second sprint weekend and will be broadcast live on Sky Sports F1. The race will provide an early test of how the ADUO framework is applied in practice, and all teams will be watching closely to see whether any upgrades are granted and how they influence on‑track performance.
Wolff’s remarks underscore the delicate balance the FIA must strike: encouraging technical development and competition while preserving the fairness and predictability that underpin the sport’s appeal. As the 2026 season unfolds, the way the governing body handles these additional development windows could become a defining factor in the championship narrative, shaping which teams are able to stay competitive and which may find themselves permanently disadvantaged. In summary, Toto Wolff is urging the FIA to enforce the ADUO rules with utmost clarity and impartiality, ensuring that any engine upgrades serve their intended purpose of narrowing performance gaps rather than reshuffling the hierarchy of Formula 1.
The next few weeks, culminating in the Miami event, will reveal whether the regulatory intent translates into a level playing field or introduces new strategic complexities for the teams vying for the title.