Just two days ahead of the start of the Canadian Grand Prix weekend, Mercedes has announced that it will not be introducing its planned engine upgrade. 'Although we had hoped to introduce PU2 this weekend, a quality issue means that this has now been delayed by one race,' said a team spokesman. 'So all Mercedes-powered cars will be running PU1 for this weekend, too, before receiving new units in France.' Renault, Honda and Ferrari are all expected to be introducing their upgraded engines this weekend, a weekend when almost all drivers were expected to make their first scheduled change under this year’s three-engine rule. Indeed, only yesterday, as he looked ahead to the Montreal...
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