Mercedes motorsport boss Toto Wolff has claimed members of his team suffered health issues last season in a bid to catch Ferrari in the power unit war.
Over the summer last year Ferrari usurped Mercedes with regard to the performance from the PU, embarking on a run of five consecutive pole positions from the Belgian Grand Prix, and scoring three successive wins at Spa, Monza and in Singapore.
It was only when a technical directive was issued at the United States Grand Prix relating to fuel flow, and a subsequent one in Brazil regarding oil-burning did the balance of power again switch.
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