Fernando Alonso has joined the ever-growing list of drivers facing penalties in Belgium after McLaren-Honda were forced to change his engine on Friday morning.
Felipe Massa is the latest driver to complain about the tyre pressures imposed by Pirelli, labelling it "a bit of a joke."
Sebastian Vettel says the warm weather at Spa is causing problems with the durability of Pirelli's tyres, which could hamper hinder Ferrari in Sunday's race.
Max Verstappen set the pace in Friday's second practice, a session in which neither Mercedes driver put in a single lap on the supersoft tyres.
Marcus Ericsson has joined Lewis Hamilton on the list of drivers facing grid penalties in Belgium after Sauber changed his turbocharger.
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