What happened: Red Bull has formally asked the FIA to take another look at the results of its ADUO assessment, the mechanism that decides how much catch-up engine development each manufacturer is permitted. Autosport reports that while the governing body weighs the request, the provisional outcome has surfaced what it calls three fundamental flaws in F1's catch-up system.
Why it matters: The challenge keeps F1's parity framework in dispute midway through the 2026 season. Mercedes was granted one engine upgrade and Ferrari two under the same ADUO rules, while Red Bull came away without tokens despite its power unit rating strongly on the grid, raising questions about what the system actually measures.
By the numbers: Provisional ADUO allocation: Ferrari two engine upgrades, Mercedes one, Red Bull none. Red Bull's internal combustion engine was rated the strongest on the grid by the FIA yet drew no catch-up tokens, the mismatch at the center of its review request.
What to watch: F1 awaits the FIA's response to Red Bull's request, with any revision potentially reshaping how upgrade tokens are allocated across the rest of the 2026 season.