FIA launches fresh ADUO verification after Red Bull questions engine rankings. FIA double-checking ADUO calculations ahead of official power unit rankings release.

ADUO: what is happening?

Before the Monaco Grand Prix weekend, the FIA was expected to officially publish the competitiveness classifications for Formula 1 power unit manufacturers, along with the corresponding ADUO allocations for each engine supplier.

However, as is now well known, the process was delayed due to the ongoing discussions surrounding the 2027 engine regulations. As a result, the competitiveness bands were communicated confidentially to the teams between Saturday and Sunday during the Monaco Grand Prix weekend.

The outcome generated considerable surprise throughout the paddock. Red Bull was identified as the benchmark engine manufacturer, while, somewhat unexpectedly, Mercedes was placed within the 2% performance band, making it eligible to introduce power unit upgrades under the ADUO framework.

Despite the widespread speculation and information circulating in recent weeks, the official confirmation has still not arrived.

Red Bull requests FIA review

According to information gathered by ScuderiaFans.com in the Barcelona paddock, the ADUO results will not be made public this week either.

Red Bull was reportedly surprised to find itself standing alone as the reference point among Formula 1 power unit manufacturers and has therefore asked the FIA to re-examine the data that led to the current classification, which should still be considered provisional.

The FIA has accepted Red Bull’s request and will conduct a fresh review of the internal combustion engine (ICE) measurements—the only component of the power unit taken into account under the current ADUO parameters. The analysis will focus on the power data collected during the first five Grands Prix through the sensors installed on every Formula 1 car, which formed the basis of the initial ADUO allocation.

This does not necessarily mean that the FIA made any mistakes in its original assessment. The governing body may ultimately confirm the same figures that emerged in recent days. Nevertheless, in order to remove any uncertainty and ensure complete confidence in the process, a new verification procedure has been launched.

The final answers should arrive before the Austrian Grand Prix on June 28, although, at this stage, some caution remains necessary until the FIA completes its review and officially publishes the results.