“PU Gate” ends: How Ferrari and Red Bull united to stop the Mercedes engine trick. The FIA has reached a decision regarding the alleged irregularity of Mercedes’ 2026 Formula 1 power unit.

Ferrari wins the case over the alleged Mercedes engine irregularity? The official FIA verdict

The issue surrounding the alleged irregularity of the Mercedes engine appears to have finally reached its conclusion. After weeks of intense debate, the FIA has delivered its verdict — but does it favor Ferrari or the German manufacturer?

For nearly two months, the Formula 1 paddock has been engaged in heated discussions regarding a suspected grey-area interpretation of the 2026 engine regulations by Mercedes. According to various reports, the Brackley-based team may have exploited an ambiguity in the rules to extract additional horsepower from its new power unit, potentially securing a competitive advantage over its rivals.

The core of the controversy centered on the compression ratio of the 2026 Mercedes power unit. Mercedes was believed to have designed its new engine by taking advantage of wording in the regulations that was not entirely clear. The alleged loophole involved increasing the compression ratio beyond what is effectively achievable under standard interpretations of the rules.

The key technical detail lay in the FIA’s inspection procedures. Regulatory checks are typically carried out when engine components are cold. However, according to the claims raised by rival manufacturers, the suspected solution could only be detected if the engine components were inspected at operating temperature. In other words, the potential irregularity might not be visible under current cold-check procedures, creating what many described as a regulatory grey area.

The official FIA verdict on the German power unit

Once Ferrari, Audi and Honda became aware of the alleged solution, they reportedly filed formal concerns with the FIA. Initially, there was an expectation that Mercedes’ interpretation might be accepted, especially given early indications of support from Red Bull.

However, following the Barcelona shakedown, the situation shifted significantly. Red Bull ultimately aligned itself against Mercedes, leaving the Brackley team increasingly isolated in the debate. With mounting pressure from rival manufacturers, discussions intensified within the FIA and among the power unit stakeholders.

According to reports from Autoracer.it, engine manufacturers are now on the verge of signing an updated version of the technical regulations. This revised framework is expected to clarify once and for all the methods and procedures governing FIA power unit inspections, effectively eliminating the ambiguity that had allowed for differing interpretations.

The updated regulation would remove the grey area that Mercedes was believed to have identified. As a result, Ferrari, Audi, Honda and Red Bull would emerge as the effective winners of this regulatory dispute, having pushed for clearer and more stringent oversight mechanisms.

What remains to be clarified is the timing of any potential adjustment or limitation applied to the Mercedes power unit developed at Brixworth. The paddock conversation has shifted from questioning whether there will be regulatory intervention to determining when it will come into effect.

In recent weeks, speculation also suggested that Ferrari might attempt to replicate the so-called “trick” attributed to Mercedes. However, sources close to the Scuderia indicate that the Maranello-based team never pursued an increase in its own engine’s compression ratio as a response strategy.

For now, the matter appears closed from a regulatory standpoint, pending the formal ratification of the updated rules. Nevertheless, further updates are expected once the new technical clarifications are officially confirmed by the FIA.

The collaborative effort between the major manufacturers highlights the immense pressure and high stakes of the 2026 technical transition. While the Mercedes “trick” may have been a masterclass in interpretation, the unified front led by Ferrari and Red Bull has successfully pushed the sport back toward a more clearly defined technical path. As the teams prepare for the first race, the focus can finally return to the asphalt, even as the echoes of this engine war continue to resonate through the paddock.