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James Vowles confirms Mercedes ADUO loophole impacts F1 regulations

Yahoo Sports • 1 min read • Latest: Jun 11, 2026, 12:50 PM

Last updated Jun 11, 2026

James Vowles confirms Mercedes ADUO loophole impacts F1 regulations

Summary

Williams Team Principal James Vowles confirmed that a recent FIA ruling regarding Additional Development and Upgrade Opportunities (ADUO) has favored Mercedes over Red Bull. The ruling restricts Red Bull’s engine development while allowing Mercedes extra budget for upgrades. Vowles highlighted the loophole in the assessment, which favors the Internal Combustion Engine (ICE) and overlooks the crucial role of the electrical Energy Recovery System (ERS). He noted that Williams stands to benefit from Mercedes’ advancements due to their partnership. Looking ahead, Vowles expressed optimism about the potential rebalancing of power unit regulations planned for 2027.

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By the Numbers

•Vowles addresses FIA's ADUO verdict favoring Mercedes
•Red Bull locked out of engine development
•Mercedes has advantage in electrical power
•Williams benefits from Mercedes upgrades
•2027 regulations may shift competitive dynamics

Latest Updates

12:50 PMYahoo Sports — “Not a Surprise”: James Vowles Publicly Confirms F1’s Massive Mercedes ADUO Loophole

What they're saying

"
The Formula 1 paddock has spent the last week quietly seething over the FIA’s first official Additional Development and Upgrade Opportunities (ADUO) verdict. The ruling effectively locked Red Bull out of engine development while handing Mercedes millions in extra budget…
— Yahoo Sports

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