Mercedes driver Nico Rosberg will use his fourth engine of the 2015 season at the Singapore Grand Prix. Lewis Hamilton and Nico Rosberg began using their third power unit in Italy a couple weeks ago as Mercedes used its remaining development tokens to try to put even more space between them and the competition. However, Rosberg was forced to revert back to the previous spec engine during qualifying due to a mechanical issue which was later discovered to be a leak in the cooling system of the power unit. Mercedes has only inspected the new unit once and will be hoping that the unit will not encounter many issues. The status and reliability of the engine will be determined during the...
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