What happened: The FIA has initiated a formal review of its engine performance findings after Red Bull Racing questioned the methodology used in recent ADUO parity calculations. The team expressed surprise after being designated the power unit manufacturer with the field-leading engine performance, a ruling that restricts their development path compared to rivals.

Why it matters: Under the ADUO parity framework, being the benchmark locks Red Bull out of mid-season upgrades while rivals Mercedes and Ferrari were granted upgrade tokens to bridge their measured ICE gaps. Red Bull's challenge targets the current ICE-only measurement system, which critics argue ignores significant electrical deployment advantages held by other manufacturers.

What to watch: The FIA is expected to issue a clarification on its findings, which could lead to a redistribution of development tokens before the next round of the championship.