Mercedes has confirmed the cause of Lewis Hamilton’s power unit issue in the closing stages of the Brazilian Grand Prix, with a full review set to take place following Friday’s practice running in Abu Dhabi.
“The problem in Brazil was caused by a failure in the variable inlet system that caused unstable combustion,” a Mercedes spokesman confirmed on Friday after the start of practice in Abu Dhabi.
Hamilton will use the same power unit for Friday’s practice running in Abu Dhabi to give Mercedes the chance to review it and consider whether it can be used for the rest of the race weekend.

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