Mercedes have confirmed that Lewis Hamilton's power unit suffered a "big-end bearing" failure during the Malaysian Grand Prix, which led to a loss of oil pressure and his subsequent retirement from the lead of the race.
"Our analysis has shown that Lewis’ engine suffered a big-end bearing failure in Malaysia," the team confirmed. "This happened without warning after 618km and was preceded by a loss of oil pressure in Turn 15."
This weekend Hamilton will revert to the engine he used in Singapore.
Mercedes also confirmed they would revise their engine parameters to minimise a repeat of the issue, whilst the planned introduction of an upgraded customer unit for Williams, Force India and Pascal Wehrlein will be delayed until Austin.
Speaking on Thursday, Hamilton said he'd moved past the disappointment: "I haven’t been thinking about the last race. Usually when I leave the racetrack I think about a lot of other things. I have a lot of other stuff going on.
"I was in Tokyo, enjoying my time. I love being in Tokyo. One of my favourite cities, it’s in my top three favourite cities in the world. That’s about it."
