On the penultimate day of pre-season testing, Mercedes-AMG Petronas Motorsport completed 182 laps, bringing the tally to 1,058 laps at the Circuit de Barcelona-Catalunya. The team started the day with some aero work before focusing on building its understanding of the new tyres. In the afternoon, the team worked on its long-run performance with a race simulation.
- Lewis was first behind the wheel of the W10, using the morning session to gather aero data and work on the tyres
- Valtteri drove the car in the afternoon, completing a race simulation
- Mercedes-Benz Power Units completed a total of 1,978 km today