Mercedes team principal Toto Wolff has appealed to the sport's governing body, the FIA, to make sure that the new 2026 power‑unit regulations – which permit manufacturers to develop their engines throughout the season – do not upset the established competitive order in Formula 1. The rule package for 2026 introduces a performance‑balancing mechanism designed to give teams that fall behind the leading engine supplier a chance to close the gap, but Wolff stresses that this assistance must not become a tool for overtaking the frontrunners. Under the 2026 technical framework, the FIA has defined three distinct windows for Additional Development and Upgrade Opportunities (ADUO).
A team may be granted an ADUO if its internal‑combustion engine is at least two percent slower than the benchmark power unit, which is expected to be the Mercedes engine at the start of the season. These windows are intended to act as a safety net, allowing the lagging manufacturers to introduce upgrades that bring them back into contention without creating a sudden leap‑frog effect that would reshuffle the championship standings. The FIA is slated to issue detailed guidance on how the ADUO criteria will be applied before the next round in Miami, where Mercedes currently sit atop the drivers' and constructors' tables after winning the first three Grands Prix.
Wolff, speaking earlier in the week, explained the philosophy behind the rule: "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. 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 added that any perception of gamesmanship would be unacceptable: "It needs to be clear that gamesmanship hasn't got any place here, but it needs to be with the right spirit here that the FIA acts upon an ADUO." Wolff's comments come at a time when Mercedes' own power unit appears to be the benchmark that other manufacturers will be measured against. The German team not only runs its own engine but also supplies it to three customer outfits – McLaren, Alpine and Williams – while Ferrari provides engines to Haas and the newly‑entered Cadillac team, and Red Bull Racing fields its own power unit for the first time, supplying its junior squad Racing Bulls. Audi, meanwhile, operates as a works team without customer customers.
In the early races, Mercedes' closest rivals have been Ferrari, whose team principal Fred Vasseur has spoken positively about the ADUO as a chance for the Scuderia to "close the gap" to the Silver Arrows. Wolff, however, hinted that the only manufacturer truly in need of assistance might be Honda, which currently powers only 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 said, suggesting that the FIA's intervention should be narrowly focused. When asked whether a Ferrari ADUO could later force Mercedes into a chase, Wolff replied that he was not worried but vigilant: "I wouldn't call it worried. 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. In that respect, I think the FIA is looking at the same data and the FIA certainly, I would very much hope that they continue to see themselves as protecting the integrity of the sport. 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 broader context of the ADUO rule is the FIA's attempt to keep the championship competitive while respecting the engineering investments that teams have already made.
By allowing a limited set of upgrades, the governing body hopes to prevent a scenario where a single dominant engine supplier monopolises performance for the entire season, which could diminish fan interest and reduce the incentive for technical innovation among the other manufacturers. Nevertheless, the implementation of the rule raises several practical questions. How will the FIA measure the two‑percent performance gap?
Will it be based on straight‑line power figures, lap‑time differentials, or a combination of telemetry data? Moreover, the timing of the three ADUO windows could influence strategic decisions: a team that receives an upgrade early in the season might gain a sustained advantage, whereas a later upgrade could be less impactful if the championship is already decided. Wolff also highlighted the importance of transparency: any decision to grant an ADUO must be communicated clearly to all teams, with the underlying data made available where possible.
This openness would help avoid accusations of favoritism and ensure that all participants understand the rationale behind each grant. In his view, the FIA's credibility hinges on its ability to apply the rule consistently and without bias. The upcoming Miami Grand Prix, scheduled for May 1‑3, will be the first test of how the ADUO framework functions in practice. It will also be the second Sprint weekend of the season, offering fans an additional short‑format race that can further shake up the order.
Sky Sports F1 will broadcast the event live, and viewers can stream the race via NOW without a long‑term contract. In summary, Toto Wolff is urging the FIA to tread carefully with the ADUO provisions, ensuring they serve their intended purpose of modestly assisting lagging engine manufacturers without destabilising the current hierarchy. As the season progresses, the balance between fostering competition and preserving the sport's integrity will be closely watched by teams, regulators, and fans alike.