Why Verstappen has taken an F1 engine penalty and Hamilton hasn’t

Verstappen changed all his Honda power unit elements between FP1 and FP2 at Sochi, and the Dutchman will thus start Sunday’s race from the back of the grid.
All teams are under pressure to switch their drivers to a fourth power unit as it becomes increasingly clear that it will be difficult to make the end of the season without a change, now that the full calendar has been confirmed.
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