Three of Formula One's four engines were heard roaring into life over the weekend.
The 2019 season begins officially next Monday with the start of pre-season testing at Barcelona's Circuit de Catalunya. World champions Mercedes posted a clip of its new engine being fired up on Friday, followed by Renault and Toro Rosso doing the same with its Honda engine -- the unit it will now share with parent team Red Bull.
Hear us roar! ud83eudd81 The W10 lives! #WelcomeW10 pic.twitter.com/rFQTeCuWQK
— Mercedes-AMG F1 (@MercedesAMGF1) February 8, 2019
In case you missed it overnight, we fired up the STR14!