Nico Rosberg will use his fourth and final penalty-free power unit from opening practice session in Singapore.
The Mercedes driver's new engine will be the updated specification which propelled team-mate Lewis Hamilton to victory at Monza. Rosberg had used the upgraded unit in practice, but unreliability problems forced him to switch to an older unit for qualifying and the race, which ultimately expired before the chequered flag.
Rosberg's problem with the new power unit in Italy wasn't directly related to the engine itself, but rather "a leak in the cooling system". However, it is still unclear if the engine will be able to be used again.
Therefore, while Hamilton still has one fresh unit to use this season, Rosberg knows his engine may have to be dialled back to cover more miles than originally planned otherwise he risks taking a grid penalty.
"I am not sure how compromising it will be going forward, most likely a small compromise at least and maybe a bigger one depending. But we don't know yet," Rosberg said.
The German trails Hamilton by 53 points in the drivers' championship meaning two victories for Rosberg and two DNFs for his team-mate would still not be enough to reverse their positions. However, Rosberg isn't giving up on the title just yet.
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