Mercedes Lose Key Ally as Red Bull Aligns with Ferrari Against 2026 F1 Engine Loophole
Mercedes have reportedly lost a crucial ally in their defence regarding an alleged engine loophole within their 2026 F1 power unit, as Ferrari intensifies efforts to see the controversial trick banned. Sources indicate that Ferrari have been actively lobbying the FIA over what they perceive as a potential regulatory loophole exploited by Mercedes to gain a performance edge. Early reports suggested that Red Bull had also utilised the same loophole, prompting questions over the alignment of the top teams on the grid.
Red Bull insiders, however, strongly refuted any claims that they had implemented the trick, and recent developments indicate that Mercedes may now be the only team currently employing it. According to insiders, the loophole could provide the German manufacturer, along with its three customer teams—Alpine, McLaren, and Williams—with an advantage of approximately three to four-tenths of a second per lap. Over the course of a full Grand Prix, such an edge could be decisive, potentially determining whether a team crosses the chequered flag in first or last place. It is unsurprising, then, that other teams on the F1 grid have expressed significant concern and frustration over the issue.
Red Bull are now understood to be ready to formally align with Ferrari, as well as Audi and Honda, in the ongoing regulatory battle against Mercedes. This shift reportedly follows revelations that the FIA had identified three potential measures to penalise Mercedes if their engine is deemed illegal. According to a report from Autosprint, Red Bull have since escalated their response by signing Ferrari’s official ‘letter of protest,’ signalling their support for stricter scrutiny of the Silver Arrows’ 2026 power unit.
The change in stance comes after the FIA reportedly agreed on a revised plan to measure engine compression ratios under warm conditions rather than relying solely on a single ambient temperature reading, as outlined in the regulations. For the new procedure to take effect, it must first undergo a formal vote involving F1 management, the FIA, and all engine manufacturers. Ferrari will only require four out of the five manufacturers to approve the plan, a procedural departure from the initial vote regarding Mercedes’ engine loophole that took place before the Barcelona shakedown. With Mercedes expected to be the sole vote against the initiative, sources suggest that the Scuderia is highly likely to succeed in its campaign.
Under the FIA’s proposed timeline, the new measurement system is scheduled to be implemented at the Australian Grand Prix, effectively rendering Ferrari’s planned protest for the season opener in Melbourne unnecessary. The updated approach will determine the legality of Mercedes’ power unit by precisely measuring the compression ratio of the cylinders, ensuring a clear and definitive ruling is available early in the season.
Mercedes, meanwhile, made a strong impression during F1’s first official week of pre-season testing in Barcelona. The Brackley-based team demonstrated both reliability and performance in their new W17 power unit, despite attempts by Mercedes insiders to downplay its competitiveness. However, the timing sheets from testing revealed impressive lap times that have not gone unnoticed by rival teams, underscoring the stakes involved in the ongoing engine regulation saga.
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