On a cold day the WilliamsF1 team would complete their four day test at the Circuit de Catalunya. Replacing mark Webber for the day was team test driver Alex Wurz. He would join Nico Rosberg.

At the end of the day Nico Rosberg would finish quickest of the Bridgestone supplied drivers with a time of 1m:15.829 to be sixth fastest time. Nico would complete forty laps. Alex would finish with a time of 1m:18.133 to be tenth fastest. Both drivers would focus on tyre testing for Bridgestone with Alex carrying out longer runs during the day.

In an interview for autosport.com Alex spoke of the day and the teams work on their new seamless gearbox.

Alex said: "I was not expecting to go quick with those tyres, but I did good work and we did long runs, which was good. On the gearbox the improvements we had in the last two weeks have been very big. It is still not our strongest point but we are pretty good there, it was a good test."

WilliamsF1 Technical Director Sam Michael commented on the days testing. He said: “Today Nico and Alex finished testing in the cold conditions in Barcelona. Nico worked on tyre testing for Bridgestone, focusing on their different compounds. Meanwhile, Alex concentrated on long runs to investigate various mechanical set-ups and brake cooling. We tested some new aerodynamic parts for the FW28 this week and confirmed they are all working as expected.”

Simon Corbyn, Head of F1 Race Engineering Cosworth, added his views:
“Cosworth completed this week’s Barcelona test in reasonable shape. The first day was difficult as we had to stop running Mark’s primary Series 2 test engine when it developed a leak which couldn’t be fixed trackside. In addition, Nico suffered an engine failure, although this was at high mileage and was an earlier spec engine. Fortunately, the remainder of the test was rather less eventful as Alex successfully exceeded the two race weekend target mileage on his Series 2 engine, plus we were able to complete valuable engine calibration work in preparation for Bahrain.”