In December, it emerged that Mercedes had found a possible loophole in the rules that could lead to a performance advantage.

Formula 1 teams are testing in Bahrain this week, but a storm is brewing in the background that might turn the season on its head. A rule change could be introduced to rein in the Mercedes power units ...

According to ESPN, the FIA will introduce stricter engine compression tests from June 2026, requiring Formula 1 teams to meet ...

FIA announces updated 2026 regulations, including new engine testing after Mercedes PU scrutiny, plus a series of rule tweaks ahead of the season.

A new engine test will be introduced after the seventh race of the 2026 Formula 1 season following a power-unit dispute over ...

The FIA will introduce a new mid-season engine compliance test in 2026 after rival teams raised concerns about a potential loophole in the sport’s new power-unit regulations, according to Sky Sports ...

Mercedes' rivals succeed in securing a rule change following a pre-season technical row over engine performance.

A political firestorm has been brewing in Formula 1 in recent weeks and months over whether engine manufacturers have found a loophole in the new 2026 technical regulations. Mercedes and Red Bull may ...