The day would see Juan Pablo only record a best time of 1m:13.070, fifth fastest. This was off the pace that he had recorded the day earlier but it was believed that he was running a much heavier car. He would complete eighty seven laps, an entire Grand Prix distance.

As for Marc he would finish the day in third with a best lap of 1m:12.725,  completing sixty three laps. Marc would end up about 2.1 seconds slower than the fastest driver of the day, McLaren's Kimi Raikkonen.

WilliamsF1 Test Team Manager Tim Newton commented on the days testing: “We had a productive day continuing on with our testing schedule. It was a fairly routine day, nothing outstanding yet a reasonable amount of mileage was accumulated. We ran tyre tests with both drivers in addition to chassis and brake work.

Marc continued driving the new BMW P83 engine with a FW24D 01 chassis while Juan drove a FW24 03. It is the penultimate day of a three-week stint of testing. The test team has worked relentlessly and will continue again at Barcelona after the new car launch next Friday.”

On Friday, the BMW WilliamsF1 Team are concluding their test drives in Valencia.

Pos. Driver Team/Engine Time Laps

1. K Raikkonen McLaren Mercedes 1:10.635 31/62
2. N Heidfeld Sauber Petronas 1:11.778 55/72
3. M Gene WilliamsF1 BMW 1:12.725 33/63
4. G Paffett McLaren Mercedes 1:12.893 40/54
5. JP Montoya WilliamsF1 BMW 1:13.070 10/87
6. A Wurz McLaren Mercedes 1:13.119 5/18