The Mercedes Formula 1 team has been left with “some question marks” as to what caused Lance Stroll’s engine failure during the Canadian Grand Prix weekend. Mercedes introduced its fist power unit upgrade of the season in Montreal, an update which was made available to both the works squad and customer teams Racing Point and Williams. All six Mercedes-powered cars ran the latest ‘Phase 2’ engine from the start of track running on Friday, before Stroll suffered a failure at the start of final practice. Racing Point subsequently reverted back to his original power unit for qualifying and the race. Mercedes boss Toto Wolff said the German manufacturer is yet to determine the cause...
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