Cosworth hope double change is a one off

The Northampton-based engine builder decided that the power units on Mark Webber and Nico Rosberg's cars needed changing before qualifying after metallic particles were found in oil during a routine inspection.

That has left Williams in a fight to even score points at the Nurburgring, but Cosworth's commercial director Bernard Ferguson is upbeat that there will be no repeat of the issue in the future.

It is the first time Cosworth have suffered the problem, and Ferguson hopes that the new Series 4 engine that was fitted to both Williams cars will rule it out happening again.

"This is the first race weekend where we have had that problem," explained Ferguson. "We had an upgraded specification for the next race weekend. As we have changed the engines, they are in now for this race. So hopefully that will help the situation."

Ferguson admitted that there was no hiding from the disappointment of the double engine change.

"We had been monitoring those engines at every session and we decided that we would reluctantly have to change them," he added.

"We are disappointed for ourselves, but more importantly we are disappointed for the team, and it impacts on our strategy. And we're disappointed it happened on a slow news day too!"