Toto Wolff has described the controversy surrounding Mercedes' new engine for the 2026 Formula 1 season as a 'storm in a teacup', downplaying suggestions that the power unit offers a significant performance advantage. The FIA recently approved the continued use of Mercedes' current engine until at least the summer break, despite rival teams raising concerns.
The dispute centres on a method discovered by Mercedes to increase the compression ratio of their power units beyond the 16.1 threshold when the engine is heated up. Current regulations only measure the ratio at ambient temperature. Wolff has claimed the benefit is minimal, perhaps only two or three horsepower.
Red Bull's Max Verstappen rejected that assessment, warning that the advantage could be ten times greater. 'You can definitely put a zero behind that,' Verstappen said, suggesting the gain could be 20 to 30 horsepower, worth around three-tenths of a second per lap. He urged the paddock to watch Mercedes' pace in Melbourne, where the 2026 season begins.
An electronic vote among power unit manufacturers is under way on whether to introduce a new hot-temperature compression ratio test. Wolff indicated Mercedes would accept a change, stating, 'It doesn't change anything for us... we also want to be good citizens in the sport because it doesn't make a big difference.'
The FIA, in a statement, noted that 'initial evidence and feedback remains immature' and that further reviews will be carried out once more data becomes available during the Bahrain test.
