Mercedes team principal Toto Wolff has appealed to the sport’s governing body, the FIA, to make sure that the new regulations allowing power‑unit manufacturers to develop their engines throughout the 2026 season do not upset the established competitive order in Formula 1. The 2026 rulebook introduces a performance‑balancing mechanism designed to give teams that fall behind the leading engine supplier a chance to catch up, but Wolff warns that the system must be applied with absolute precision, transparency and fairness to avoid any unintended reshuffling of the championship leaderboard. Under the fresh power‑unit framework, the FIA has defined three windows of Additional Development and Upgrade Opportunities – commonly referred to as ADUOs – that will open during the course of the season. Teams whose internal‑combustion engines are judged to be at least two percent slower than the benchmark unit will be eligible for these extra development slots.
In theory, this should level the playing field by allowing the slower manufacturers to introduce performance‑enhancing upgrades without granting them a wholesale advantage over the front‑runners. The governing body is expected to issue detailed guidance on how the ADUO criteria will be measured and applied before the next round in Miami, where Mercedes currently sit atop the standings after winning the first three Grand Prix. Wolff stressed that the spirit of the rule is to enable a modest catch‑up, not to facilitate a dramatic leap‑frog that could overturn the existing pecking order. "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 earlier in the week.
Wolff also warned that any decision to grant an ADUO carries significant weight. "It needs to be very clear that whatever decisions are being made, whichever team is granted ADUO, that any such decision may have a big impact on the performance picture and on the championship, if not done with absolute precision and clarity and transparency," he explained. He added that gamesmanship has no place in the process and that the FIA must act with the right spirit, ensuring that the integrity of the sport is preserved. Mercedes’ own power unit, built in‑house, has set the benchmark for the season, and the team’s dominance suggests that its engine will likely become the reference point for any ADUO allocations.
Wolff hinted that the only manufacturer that might genuinely need assistance is Honda, which currently supplies engines solely to Aston Martin. "The teams will have their performance pictures and, as it seems for me, there's one engine manufacturer that has a problem and we need to help. And then all the others are pretty much in the same ballpark," he observed. He expressed disappointment at the prospect of ADUO decisions that could disturb the current hierarchy: "So, I would be very surprised, actually, and disappointed if ADUO decisions that were done would come up with any interferences into the competitive pecking order as it stands at the moment." Mercedes is a works team that not only runs its own engines but also supplies three customer outfits – McLaren, Alpine and Williams.
Ferrari, another works team, provides power units to Haas and the newly‑entered Cadillac. Red Bull has entered the arena with its own in‑house engine for the first time and supplies its junior squad, Racing Bulls, while Audi operates as a works team without any customer teams.
Ferrari, Mercedes’ closest rival in the opening rounds, has welcomed the ADUO concept as an opportunity to close the gap to the Silver Arrows. Team principal Fred Vasseur has spoken publicly about using the extra development windows to narrow the performance differential.
When asked whether a Ferrari‑granted ADUO could force Mercedes into a reactive chase later in the year, Wolff replied that he was not worried but vigilant. "I think we are all monitoring how decisions are being made. And we have precise data from our own analytics of where we see engine performance of our competitors and ourselves," he said. Wolff emphasized that the FIA’s data-driven approach should align with the teams’ own analytics, and he expressed confidence that the governing body would continue to protect the sport’s integrity.
"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," he concluded. 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. As the championship progresses, the handling of ADUO allocations will be closely watched by all teams, as any perceived bias or misapplication could spark controversy and potentially reshape the competitive landscape.
Fans can follow the developments via Sky Sports’ streaming platform, which offers a contract‑free option through NOW, allowing viewers to cancel at any time. The broader F1 community will be keen to see whether the FIA’s implementation of the ADUO system maintains a balanced, fair competition or inadvertently creates new disparities among the power‑unit manufacturers.