The FIA has finally put an end to the controversy over Mercedes’ compression ratio that had unsettled the paddock for months, doing so without entirely contradicting its previous decisions. The modification to the measurement system—which from June 1, starting at the Monaco Grand Prix, will include both cold and hot checks—represents an operational clarification rather than a technical rejection of what had been approved so far.
The heart of the dispute
The controversy centered on the Mercedes power unit, accused by some rival manufacturers of exploiting a regulatory grey area that allegedly allowed the engine to reach a compression ratio of 18:1 under full operating conditions, against the regulatory limit of 16:1. Because checks were previously carried out at ambient temperature, that value could not be detected under the existing control procedures.
However, the FIA had already pre-approved the project. This is the key political and regulatory point: retroactive intervention would have implied admitting an interpretation or oversight error. The adopted solution—updating the measurement method without revisiting prior compliance—allows the FIA to close the debate while safeguarding its institutional consistency.
Mercedes and Ben Sulayem’s support
Toto Wolff, Mercedes’ team principal, clarified the situation, revealing that FIA president Mohammed Ben Sulayem never doubted the legality of the German manufacturer’s power unit.
Wolff’s statements, published by Planet F1, were clear and deserve to be quoted in full:
“Not only the teams matter. You need the votes of the governing body and those who hold the commercial rights. If they decide to share an opinion and an agenda, it can be annoying. Meanwhile, we had the support of Mohammed Ben Sulayem. He is very interested in motorsport, and from his point of view, it was clear what the regulations said and that the rules were being applied correctly.”
Asked whether the FIA president can influence the resolution of such a major dispute, Wolff replied without hesitation: “Well, yes, of course, he’s the FIA president. You have all the power in your hands to participate in decisions. Ultimately, the decision is theirs.”
No conspiracy, just political balance
The most representative part, however, concerns the political framing of the matter. Wolff rejects the idea of a coordinated move against Mercedes and also highlights the role of Formula 1 CEO Stefano Domenicali.
“When there’s a large majority—the four engine manufacturers, plus Stefano and Mohammed—then you can say… Okay, this is no longer a conspiracy against a supplier. Because I think Stefano will always see it from the outside looking at the teams, as I said, as a strategy or manipulation.”
The point is clear: when alignment occurs between manufacturers, the FIA, and the commercial rights holder, the dynamic shifts from a bilateral conflict to a systemic one.
The final decision and its implications
The decision—unanimously accepted, including by Mercedes—represents a technical-political compromise. From a regulatory standpoint, the FIA chose to refine the control tool rather than rewrite the regulatory principle. Institutionally, it avoided disavowing a previously granted validation.
Substantively, the message is twofold: the rules were applied correctly under the existing parameters, but the parameters themselves could be improved. A subtle distinction, but crucial to preserving the FIA’s regulatory authority and the legitimacy of the technical checks carried out so far.
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