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Mercedes have revealed a 'big-end bearing failure' caused Lewis Hamilton' engine to fail during the Malaysian Grand Prix.
Hamilton was on course for victory at Sepang when he was forced to bring his Mercedes to a halt 15 laps from the end due to internal engine combustion.
Mercedes flew the engine back to their base in the UK in a bid to get to the bottom of the problem and the world champions have discovered a bearing failure was to blame.
"Our analysis has shown that Lewis' engine suffered a big-end bearing failure. This happened without warning after 618km and was preceded by a loss of oil pressure in Turn 15," the team said.
"For this race weekend, Lewis will revert to his Singapore unit and Nico will use his Malaysia engine."
As a result of the engine failure, Mercedes has delayed a planned upgrade for Force India, Williams and Manor.
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