Overview
- Audi quietly fitted upgraded internal‑combustion engines and turbochargers to both cars at the Barcelona weekend, with changes focused on drivability rather than a large power jump.
- Ferrari will deploy its first ADUO‑credited internal‑combustion update at the Austrian Grand Prix and plans a larger turbocharger revision after the summer break.
- The FIA’s initial ADUO assessment designated Red Bull as the ICE benchmark and granted concessions to Mercedes, Ferrari, Audi and Honda, but Red Bull has formally challenged the measurements and the FIA is rechecking torque‑sensor data.
- ADUO relief applies only to the internal‑combustion element measured by standardised in‑car torque sensors and brings extra homologation slots, dyno/testing hours and scaled cost‑cap allowances that still require months of engineering to turn into race‑ready gains.
- Two further ADUO review windows remain later this season and any changes from the FIA recheck could alter manufacturers’ upgrade entitlements and their longer‑term 2026–27 development roadmaps.