Red Bull defends “legitimate” engine swap after McLaren's cost cap "hand grenade"

Red Bull says it has "no worries" about the controversial engine change made to Max Verstappen's RB21 ahead of the Brazil Grand Prix, despite McLaren raising questions over how such a change fits into Formula 1's cost cap rules.
But although the team insists it is "absolutely within the regulations", the debate has highlighted a grey area that exists within the current set-up.
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