Formula 1's governing body has approved a compromise on compression ratio rules that satisfies both Mercedes and its competitors ahead of the 2026 season. The dispute centered on whether Mercedes could achieve a higher ratio when engines were running hot versus static testing at ambient temperature.

Initially, the FIA didn't see the need for change after a January meeting of technical experts. However, the regulations' wording proved insufficient to prevent potential advantages, prompting a supermajority vote among power unit manufacturers. Nikolas Tombazis, FIA single-seater director, explained that both sides had valid arguments based on different rulebook articles.

The compromise requires dual testing - one cold and one at 130 degrees Celsius - starting June 1st instead of the original August date. Mercedes team principal Toto Wolff called it "a fair game" since it prevents rivals from exploiting opposite temperature advantages. The solution represents a textbook F1 compromise where both sides gained something while maintaining competitive balance.