Mercedes, along with their customer teams, have backed out of running their new, upgraded power unit for this weekend's race in Montreal. Mercedes were due to roll out a new spec, upgraded power unit for this weekend, which would have seen their works team and customers Williams & Force India all run the new engines; this would have been keeping with their originally planned schedule from earlier this year. But 'quality issues' with the new power units mean that this planned upgrade has been put off to the next round, set for Paul Ricard in south France. This means that the now heavily-used previous engines will continue to be used for an extra race. According to the BBC, Mercedes say this...
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