Haas team principal Guenther Steiner has been impressed by reliability levels in testing so far, though Haas has done the fewest laps of any team.
Lando Norris says the new McLaren has "improved compared to last year in some areas" but hasn't made enough of a step in others.
Ferrari team principal Mattia Binotto says they still aren't quick enough despite leading today's test, and warned Racing Point could be a "threat" to them.
Ferrari and Mercedes had contrasting fortunes on the fifth day of pre-season testing at the Circuit de Catalunya. Sebastian Vettel was quickest, Lewis Hamilton stopped.
Mercedes' DAS system is due to get its race debut at the first grand prix of 2020. Valtteri Bottas explained the drivers have been given "guidelines" on how to use it.
Formula 1 teams have had to make changes to their travel arrangements for the opening races of 2020 due to concerns over the spread of the coronavirus.
Max Verstappen admitted he didn't notice the damp patch at turn five when he spun into a gravel trap during today's test.
Williams deputy team principal Claire Williams says the sport needs more than just six days of pre-season testing for car development and young driver evaluation.
Sebastian Vettel took 1.2 seconds off Ferrari's best time of pre-season testing so far after he and several other drivers had spins on Thursday morning.
Pictures from the fifth day of testing for the 2020 F1 season at the Circuit de Catalunya. This gallery will be updated throughout the day.
Join us to follow day five of testing for the 2020 F1 season on RaceFans Live.
Williams deputy team principal Claire Williams admitted she feels "frustrated" how much running the team has lost due to problems outside of its control.
In the round-up: This could be the best car I've ever started a season with - Perez • Coronavirus leads GT Open to postpone Catalunya test • Penske steps back from Power strategy role
Mercedes became the first team to break the 3,000 kilometre mark on the fourth day of pre-season testing but power unit problems held Williams back again.