Toto Wolff, Team Principal at Mercedes, has spoken out about the FIA's ADUO mechanism and its potential impact on team performance throughout the 2026 Formula 1 World Championship.

In comments reported by Diario AS, the German team's chief addressed the difficulties currently facing Fernando Alonso's outfit: "All teams will have their own performance estimates relative to the other power units, and as I see it, there is one engine manufacturer with a significant problem — and we need to help them."

"The rest are more or less in the same ballpark, so I would be quite surprised — and disappointed — if ADUO decisions were made that interfered with the current competitive order. The whole point of ADUO was to allow teams that were behind on power unit performance to close the gap, not to use it as a launch pad."

"Any team granted additional ADUO tokens must be treated with complete precision, clarity, and transparency, because the performance impact is substantial and could influence the championship outcome. I'm not talking about sportsmanship here — I'm talking about the proper spirit of the regulation."

ADUO — Additional Development and Upgrade Opportunities — is a framework designed to prevent any single manufacturer from establishing an insurmountable technical advantage over the course of a season. It operates through four evaluation windows per year, each triggered after every sixth race, at which point a specific performance index is used to compare the relative output of each power unit on the grid.

The system was built on the understanding that not all manufacturers would arrive at the start of the 2026 season on equal footing. Any manufacturer found to be more than two percent below the benchmark power unit is granted access to additional development and upgrade opportunities beyond the standard allocation.

Crucially, the evaluation does not assess peak power output in isolation. Instead, it draws on a broader performance index that reflects the overall effectiveness of the power unit across a race weekend.

Under normal circumstances, each manufacturer is permitted one upgrade per component per year. However, for those who fall short of the two-percent threshold, the regulations become considerably more permissive. A deficit of between two and four percent unlocks one additional upgrade token for both the current and following season.

If the gap exceeds four percent, the number of authorized upgrades doubles. Beyond the extra components, disadvantaged manufacturers are also granted additional dyno time and benefit from a degree of relaxation in the cost cap applied to power unit development.