The political paddock battle delaying the FIA’s critical ADUO engine ruling. ADUO delay sparks speculation as FIA and manufacturers discuss 2027 engine rules.

When will the ADUO results be announced?

On May 8, the FIA issued a clarification to the Formula 1 technical regulations, formally defining the three ADUO assessment periods for the 2026 season. Following the sixth, twelfth and eighteenth rounds of the championship, the governing body is expected to evaluate the performance of each power unit manufacturer and assign them to specific performance categories.

Those classifications are particularly important because manufacturers found to be trailing the benchmark power unit could be granted additional development opportunities under the ADUO framework. The goal is to prevent a significant performance gap from emerging and to maintain a competitive balance among engine suppliers throughout the current regulations cycle.

Based on the timetable established by the FIA, many expected the results of the first ADUO assessment period to be released shortly after the Canadian Grand Prix, which took place on May 24. However, despite the passing of nearly two weeks, there has still been no official communication regarding the outcome of that review.

Why is there a delay?

Thirteen days have now passed since the Canadian Grand Prix, yet no ADUO announcement has been made. Even more surprisingly, the topic has barely surfaced publicly during the Monaco Grand Prix weekend, with neither drivers nor team principals offering any substantial comments on the matter.

So what is happening behind the scenes?

It is no secret that intensive discussions have been taking place in Monaco regarding possible adjustments to the 2027 Formula 1 power unit regulations. Those negotiations have become one of the most significant political topics in the paddock, as manufacturers continue debating potential changes to the future engine formula.

The issue is closely linked to ADUO because any modification to the 2027 regulations could directly affect the value and purpose of the additional development opportunities currently being discussed. One of the proposals under consideration involves increasing fuel flow limits, which could allow manufacturers with the strongest power units to carry out substantial redesign work on their engines.

According to paddock speculation, Ferrari is among those reportedly concerned by this possibility. The fear is that if leading manufacturers are granted broader redesign opportunities through future regulatory changes, the competitive balancing effect intended by ADUO could be significantly weakened before it even has a chance to deliver meaningful results.

Paddock reports point to political discussions

According to several journalists covering the Monaco Grand Prix weekend, the ongoing political negotiations surrounding the 2027 engine regulations may be the main reason behind the FIA’s delayed ADUO announcement.

Thomas Maher of PlanetF1 suggested on X that the ADUO results were unlikely to be communicated before meetings scheduled with the power unit manufacturers during the Monaco weekend.

Julianne Cerasoli expressed a similar view on X, noting that there had been significant movement in Monaco regarding the 2027 engine discussions and indicating that the delay in publishing the ADUO findings appeared to be connected to those ongoing negotiations.

For now, the FIA has not provided any official explanation for the delay, leaving teams, manufacturers and fans waiting for clarity. What seems increasingly clear, however, is that the ADUO process may be tied more closely than expected to the broader political battle currently unfolding over Formula 1’s future engine regulations.