What happened on Day 4 of the Barcelona Shakedown?

Day four of the Barcelona Shakedown concluded, with Mercedes and Racing Bulls wrapping up their allocated three days. Andrea Kimi Antonelli and George Russell expressed satisfaction with the W17's extensive mileage and positive feel. Liam Lawson of Racing Bulls noted significant progress. Ferrari's Lewis Hamilton and Charles Leclerc praised extensive dry running, gaining valuable insights into their new SF-26, with Hamilton calling the start "better than we've experienced in the past." Oscar Piastri for McLaren faced a fuel system issue, curtailing his session but highlighting the crucial learning phase for their MCL40. Aston Martin debuted with Lance Stroll, who felt good in the new AMR26, featuring a Honda power unit. Eight teams retain track time options for Friday, preceding the Bahrain pre-season tests.