The FIA's World Motor Sport Council implemented several changes to F1's sporting and technical regulations at its meeting in Paris on Wednesday.
In a bid to improve engine reliability, a weak point this season for F1's manufacturers, the rules regarding the current power unit limits have been tweaked.
Teams will now be permitted to undertake temporary changes to their power units in order to avoid adding new elements and risking grid penalties.
But teams will also be allowed to swap an engine or elements in parc fermé with new components or a unit of a newer specification between qualifying and the race without incurring a pitlane start.
Formula 1's 2026 engine regulations were also on Wednesday's agenda in Paris but were not signed off as expected.
An interim agreement on the engine rules is nevertheless expected in the coming weeks, an accord that should be followed in short order by the announcements of Porsche and Audi's entry into F1.
Other decisions rubber-stamped by the WMSC involve a change in the rules regarding car limitations for tyre testing, a tweak brought about by the controversy that surrounded Ferrari's use of a modified floor during a tyre at Imola back in April.
Deflection tests for Rear Wing Mainplane Trailing Edge and Beam Wing Flexibility have been updated
Fuel will now be permitted to be chilled to 20°C at hotter races. The temperature reference will be taken one hour in advance of the session
On the sporting front, the FIA has rescheduled all media activities on F1 weekends back to Thursday, as was the case before this year, rather than Friday.
The change was decided in consultation with teams and drivers who were left this season with a heavy burden of work on Friday under the new schedule.
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