"So all Mercedes-powered cars will be running PU1 for this weekend, too, before receiving new units in France".
A four-time Formula One champion, Hamilton is looking for his fourth straight win and his seventh overall in Montreal, which would tie Michael Schumacher for the most at the track; no one else has won more than three times. This was because, new parts were required to fix an engine problem that the Australian suffered in Monaco.
Meanwhile, Rival engine manufacturers Honda and Renault are pressing ahead with planned power-unit upgrades this weekend.
Walls line much of the track situated on an island in the St. Lawrence Seaway and none are more famous than the "Wall of Champions" situated at the final chicane which has claimed victim to many top drivers over the years.
The race takes place Sunday in Montreal.
It means then that opportunities await for all midfield teams and the unique demands could see a shake-up in the competitive order.
Mercedes' decision affects all of its teams and drivers, so in addition to factory drivers Lewis Hamilton and Valtteri Bottas, Force India's Sergio Perez and Esteban Ocon and Williams' Lance Stroll and Sergey Sirotkin will also stick with the engines they have been using since the start of the season.More news: Kim Jong Un impersonator held by Singapore immigration
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"This was one that got away and it's a bitter pill for us all to swallow", Wolff said. However, on arrival in Canada, the team confirmed the upgrade would be delayed until the French Grand Prix in two weeks' time.
But others have also found the track to their liking including two of Hamilton's biggest challengers.
Toro Rosso's performance will also be engine based despite a good showing on a similar track in Bahrain back in April, but with Honda bringing upgrades reportedly worth almost 30 more horsepower, if reliable it could be a big step forward.
Southern Ontario last hosted the Grand Prix in 1977, when Bowmanville Ontario's Mosport Park was the site for the F1 auto race. Instead of that, we'll use the new one in Budapest.
They said that the engine was not doing more miles than intended.