Mercedes has allocated new power units to Lewis Hamilton and George Russell for this weekend's Spanish Grand Prix in Barcelona.
The Brackley squad's engine swap includes for each driver a new Internal Combustion Engine (ICE), a new Turbocharger, Motor Generator Unit-Heat (MGU-H) and Motor Generator Unit-Kinetic (MGU-K).
Mercedes has also fitted a new Exhaust System to both its cars. As the changes are the first undertaken by the team this season, no penalties apply.
In addition to Mercedes, Alfa Romeo has fitted a new MGU-K and exhaust system to Guanyu Zhou's PU, while Red Bull has added a new Exhaust System to Sergio Perez's pool of hardware.
Finally, Aston Martin's Sebastian Vettel is running a new Energy Store.