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 power‑unit rulebook introduces a performance‑balancing provision that grants additional development opportunities to any manufacturer that falls behind the leading engine supplier by a defined margin.
Specifically, the regulations outline three distinct windows for what are termed Additional Development and Upgrade Opportunities (ADUOs). A team that is judged to be at least two percent off the pace of the fastest internal‑combustion engine will be eligible for these extra upgrades. The governing body, the FIA, is expected to clarify how these rules will be applied before the next race weekend in Miami, where Mercedes will enter as the clear frontrunners after winning the first three Grands Prix of the year.
Wolff emphasized earlier in the week that the intention behind ADUO is to give teams that are lagging in power‑unit performance a chance to close the gap, but not to allow them to overtake the leaders in a single leap. "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 warned that any decision about which team receives an ADUO must be handled with absolute precision, transparency and fairness, because such a decision could dramatically reshape the competitive picture and influence the championship outcome. "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," Wolff added. He also stressed that gamesmanship has no place in the process and that the FIA must act in the true spirit of the sport.
Mercedes’ own power‑unit, which the team designs and builds in‑house, appears to be the benchmark that other manufacturers will be asked to chase. Wolff hinted that among the current suppliers, Honda – which only powers Aston Martin – may be the one most in need of assistance.
"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 explained.
He expressed surprise and disappointment at the prospect of ADUO decisions that could upset the existing hierarchy, saying he would be shocked if the mechanism altered the current pecking order. In the modern F1 landscape, Mercedes is a works team that not only runs its own engines but also supplies three customer teams – McLaren, Alpine and Williams.
Ferrari, another works outfit, provides power units to Haas and the newly entered Cadillac. Red Bull has built its own power‑unit for the first time and supplies its junior team, Racing Bulls, while Audi operates as a works team without any customer entries. This mix of works and customer relationships means that any change to the performance balance can ripple through multiple teams.
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 principal Fred Vasseur has spoken about using the extra development windows to "close the gap" to Mercedes. When asked whether he feared that Ferrari might gain an advantage that could force Mercedes into a chase later in the season, Wolff responded 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 expressed confidence that the FIA would base its decisions on the same data and 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 reiterated.
The upcoming Miami Grand Prix, scheduled for May 1‑3, will be the second sprint weekend of the season and will be broadcast live on Sky Sports F1. The race will provide an early test of how the FIA implements the ADUO framework and whether any adjustments are made that could influence the championship trajectory. As the season progresses, the balance between fostering competition and preserving the existing order will remain a central topic of discussion among teams, regulators and fans alike. In summary, Wolff’s message to the FIA is clear: the additional development windows must be administered with utmost fairness, transparency and a strict adherence to their original purpose of enabling lagging teams to catch up, not to overhaul the competitive hierarchy.
The FIA’s forthcoming clarification will be closely watched, as its interpretation of the ADUO rules could have lasting implications for the dynamics of Formula 1 in 2026 and beyond.