Lewis Hamilton has admitted that he drove in fear of engine failure during the United States Grand Prix.
The three-time world champion's season has been plagued by reliability problems, and he had to have his fuel system replaced earlier in the weekend.
As the season winds down, that issue clearly played on the mind of the Mercedes driver as he raced to his 50th career win.
"The whole race I was concerned the car wasn't going to make it," he admitted. "Right up to the line, I was just in fear of hearing the same sound I heard in Malaysia so I'm grateful the car made it across the line."
"The whole race I couldn't get my mind off the reliability issues because we had another problem through qualifying yesterday," Hamilton said. "I was down on power to Nico today which would have cost me almost two seconds, so I was conscious sometimes down the straight I was half throttle, just please don't go, and fortunately it didn't."
Bahrain International Circuit - Winter testing