Mercedes team principal Toto Wolff has publicly appealed to the FIA to guarantee 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 One. The rule in question introduces a performance‑balancing mechanism designed to give teams that fall behind the leading engine supplier by a defined margin the chance to make additional upgrades. Specifically, the regulations outline three distinct windows of Additional Development and Upgrade Opportunities (ADUO) during the year. Any manufacturer whose internal‑combustion engine is assessed to be at least two percent slower than the benchmark engine will be eligible for these extra development periods.
The governing body is expected to clarify how the ADUO system will be applied before the next race weekend in Miami, where Mercedes enters the event with a clear points lead after winning the first three Grands Prix. Wolff emphasized that the original intent of ADUO is to help lagging teams close the gap, not to enable them to overtake the frontrunners. "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 granting ADUO must be made with "absolute precision, clarity and transparency" because it can dramatically reshape the performance landscape and, consequently, the championship battle. Wolff also stressed that the FIA must guard against any form of gamesmanship. "It needs to be clear that gamesmanship hasn't got any place here," he added, insisting that the spirit of the rule is to preserve fair competition rather than to be exploited for tactical advantage. He expressed confidence that the FIA will act in line with that spirit, ensuring that any ADUO allocation is transparent and based on solid data.
Mercedes' own power unit, built in-house, has become the de‑facto benchmark after the team’s dominant start to the season. As a result, other manufacturers may be granted the chance to develop their engines to match Mercedes' performance level.
Wolff hinted that, at the moment, Honda – which supplies only Aston Martin – appears to be the sole engine maker in need of assistance. "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 remarked, indicating that he would be surprised and disappointed if ADUO decisions altered the current pecking order. The current engine supply landscape adds further context.
Mercedes, as a works team, also provides power units to three customer teams: McLaren, Alpine and Williams. Ferrari, another works outfit, supplies Haas and Cadillac, while Red Bull has recently brought its own engine to the grid and supplies its junior team, Racing Bulls.
Audi, meanwhile, operates as a works team without any customer entries. This mix of works and customer relationships means that any ADUO granted to a manufacturer could have ripple effects across 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 improve Ferrari's power unit performance.
When asked whether he feared that a Ferrari ADUO could later force Mercedes into a chase, Wolff responded that he is not worried, but rather vigilant. "I think we are all monitoring how decisions are being made," he said, adding that Mercedes possesses precise analytics on both its own engine and those of its competitors. He trusts that the FIA will rely on the same data and continue to protect the sport's integrity. Wolff reiterated that the ADUO system was conceived as a catch‑up tool, not a leap‑frog mechanism.
He warned that allowing a team to receive an upgrade that propels it ahead of the current leader would undermine the purpose of the rule and could damage the credibility of the championship. "Because you don't want to allow an ADUO to a team that suddenly leapfrogs someone," he explained. "The ADUO was always meant as a catch‑up mechanism and not as a leapfrog mechanism." Looking ahead, the Miami Grand Prix, scheduled for May 1‑3, will be the season's second Sprint weekend and the first test of how the FIA implements the ADUO framework. The event will be broadcast live on Sky Sports F1, with streaming options available through NOW without a long‑term contract.
As the season progresses, the balance between maintaining a stable competitive hierarchy and providing genuine opportunities for struggling engine manufacturers will remain a focal point of discussion among teams, regulators, and fans alike. Wolff's appeal underscores the delicate nature of this balance and the importance of transparent, data‑driven decision‑making to preserve the sport's fairness and excitement.