While its rivals introduced their upgraded engines in Canada, the last minute discovery of quality control issues whilst on the dyno at Brixworth meant that Mercedes opted to stick with its old units. However, ahead of this weekend's French Grand Prix, where the German manufacturer was expecting to finally introduce the upgrade there is talk of it being delayed still further. With the old units having done the required seven races, Mercedes finds itself in a quandary. Either it sticks with the old engine - which would be its eighth race - and introduce the new unit in Austria or take the risk and introduce the new unit this weekend. On the other hand, should it run a new unit this weekend,...
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