FIA Heats Up Engine War, Sides with Ferrari Over Mercedes

The engine scandal surrounding a Mercedes design decision has taken a decisive turn in favor of Ferrari, Honda, and Audi, following their formal complaints to the FIA over an alleged regulatory loophole.

The controversy centers on the Mercedes-Benz V6 power units. While they complied with the letter of the regulation during standard cold bench tests, investigations suggest they were capable of exceeding the new mandated 16:1 compression ratio limit when running at full, hot operating temperatures.

Wolff's Defiant Stance Mercedes Team Principal Toto Wolff recently took a hard line, stating: "Our system is perfectly legal; it adheres to the regulation and the control criteria. The others should hurry up. Perhaps some are looking for excuses if things are not going well for them."

A New Measurement Standard However, Wolff’s stance did not end the discussions. In a pivotal meeting today with teams and Formula 1 management, the FIA agreed to change the testing criteria. A new method will be introduced starting from the Australian Grand Prix. It involves measuring V6 components statically, but after they have been properly heated to simulate on-track conditions.

Red Bull Shifts, Aligning with Ferrari This change must now pass a vote. Although it is a mid-season technical regulation alteration, it does not require unanimity but a qualified majority: approval from the FIA, Formula 1, and four of the five engine manufacturers.

The lone vote against is expected from Mercedes. In a significant shift, Red Bull Powertrains—alongside Honda and Audi—is now prepared to join Ferrari's firm position, having initially refused to sign the formal letter of protest. This alliance creates the necessary majority against Mercedes.

Customer Teams Face Headaches The new measurement criteria also spell trouble for Mercedes' customer teams:

• McLaren, the reigning world champion, faces a significant challenge to defend its title.
• Williams and Alpine are also set to be impacted, potentially derailing their competitive development for the 2026 season.

The stage is set for a fiery technical and political confrontation as the sport heads to Melbourne.