Mercedes technical boss Paddy Lowe says the team is still undergoing a complete investigation into what caused Lewis Hamilton's engine blowout while leading the race at Sepang.

The defending F1 champion endured a painful end to the race in Malaysian with a rare mechanical retirement when his engine gave up 16 laps from the chequered flag leaving Hamilton to slip 23 points behind Nico Rosberg who recovered from a first turn spin to finish third.

Hamilton vented his disbelief and frustration at the engine failure immediately after the race after sustaining yet another power unit problem in 2016.

Lowe says the cause of the problem has not been pinpointed yet by Mercedes but once the investigation is complete the team will rectify the issue on its remaining power units.

"Malaysia was a bitter pill to swallow. We let Lewis down in a big way," Lowe said. "We are continuing to investigate the issue with his engine are doing everything we can to ensure that it is first understood and then contained for the remainder of the season."

READ: Hamilton talks 'hurt' after Sepang blow

"As it stands, despite the failure of this engine, Lewis now has the same stock of Power Units as Nico for the remaining five races - including used Power Units which he can fit for free practice sessions."

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