What happened: Audi introduced a new Formula 1 power unit at the Barcelona Grand Prix, according to Autosport. The upgrade followed the FIA communicating the results of the first ADUO period, the mechanism that governs in-season engine development allowances.

Why it matters: A mid-season power unit change is rare and signals Audi is pushing hard for performance rather than settling into the back of the grid. It also shows how the FIA's ADUO parity framework — the same process that handed Mercedes one engine upgrade and Ferrari two — is actively reshaping the competitive order this season.

What to watch: Watch whether the upgraded unit translates into lap-time gains at the upcoming Austrian Grand Prix at the Red Bull Ring, and whether rivals contest the timing of Audi's introduction under the ADUO rules.