In the days following the Australian Grand Prix, among the various other race postponements and cancellations, and the news that the rule changes proposed for 2021 would be held over for another year, McLaren confirmed that it was going ahead with its plan to switch from Renault power units to Mercedes. While the mounts for all four makes of power unit have to be the same, the different architecture of the Mercedes unit meant that changes would need to be made to the MCL35's chassis, though the rules appeared to suggest this would not be allowed as it was made clear that no changes could be made to the 2020 cars heading into 2021 other than aero development. McLaren has now confirmed...
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