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.<br>But although the team insists it is "absolutely within the regulations", the debate has highlighted a grey area which exists within the current set-up.<br>When ...<a class='more' href='https://www.autosport.com/f1/news/why-red-bull-has-no-worries-over-mclarens-engine-hand-grenade/10778485/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-ALL&utm_term=News&utm_content=uk'>Keep reading</a>