Mercedes is assessing how it will proceed with its engine plans for the remainder of the season following Valtteri Bottas' second engine change in Russia, the second in two races for the Finn. After exceeding his three-engine quota at Monza, Bottas was assigned a fifth power unit in Russia, which justified the Finn's grid penalty on Sunday. But a pneumatic problem detected on a Mercedes engine powering Williams' Nicholas also compelled the manufacturer to add a fourth unit to the Canadian's engine inventory. Championship leader Lewis Hamilton is still relying on two healthy engines, but mileage accumulation coupled with emerging reliability concerns could force Mercedes to add a fourth...
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