Red Bull Racing's new seamless shift gearbox continues to cause the team problems, this time with David Coulthard coming off worst and retiring from the Canadian Grand Prix.

The Scot had started from 14th, after making the cut from Q1 by the skin of his teeth, but was unable to make serious progress in the opening stages of the race and gradually became hobbled by the latest gearbox gremlin which, despite being intermittent, eventually proved terminal.

"I had a gearbox problem exiting the chicane and had difficulties moving up through the gears," DC revealed, "It started to work again, but the gearbox temperatures had risen so much that I had to park the car. It remains to be seen what caused the problem, we need to wait and see."

With Montreal again providing a race of attrition, with no fewer than ten cars retiring, both Coulthard and team boss Christian Horner believed that the Scot could have been in line for points had the RB3's internals held together.

"It's obviously disappointing, as I think our strategy could have worked well for us," Coulthard sighed, having pitted under the first of four safety car periods.

"David had no choice but to pit under the safety car, as he was right in his fuel window when it came out," Horner revealed.

Team-mate Mark Webber appeared on course for points only for a late fuel and tyre stop to restrict him to ninth at the flag.



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