In December, it emerged that Mercedes had found a possible loophole in the rules that could lead to a performance advantage.
Mercedes' rivals succeed in securing a rule change following a pre-season technical row over engine performance.
The FIA has updated the 2026 F1 engine rules, changing how compression ratios are measured to prevent loopholes.
FIA announces updated 2026 regulations, including new engine testing after Mercedes PU scrutiny, plus a series of rule tweaks ahead of the season.
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