Mercedes team principal Toto Wolff has said that he feels encouraged by the W15 after early showings in Bahrain.
The new 2024 challenger took to the track in its first official run in the morning session on Wednesday, with George Russell piloting the car to sixth fastest, over one and a half seconds down on Max Verstappen – and he also took part in the afternoon session.
Mercedes will be hoping for consistency in 2024 after a difficult couple of years in the ground effect era with just one win in the last two seasons, coming from Russell in Brazil in 2022.
"That has been the emphasis for this season to have a stable platform from we can actually develop onwards. Let's see if we have that.
"It's very difficult to say. We had a filming day yesterday and some aero running this morning, so not relevant lap times, but so far the feedback from the drivers was 'yeah, this is something we can work with' so that is encouraging."
Lewis Hamilton will make his first appearance in pre-season testing as he pilots the W15 in both sessions on Thursday.