Formula 1's current manufacturers will now be allowed to develop their engines during the 2015 season, after the FIA accepted there was a loophole in the regulations.
Mercedes' rivals Ferrari and Renault pushed hard in late-2014 for F1's engine freeze to be eased to give them more time to introduce much-needed upgrades, rather than having to complete all changes to a pre-season deadline.
But with Mercedes standing firm and refusing to concede much ground, it appeared that Ferrari and Renault's hopes of extra time were dashed.
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