Sebastian Vettel was left lamenting his lack of running in Friday's practice for the Turkish Grand Prix, after being hit by engine problems.
The Red Bull racer managed just four laps in the afternoon session after stopping his car when he felt a severe vibration. The problem turned out to be related to the engine.
Despite his lack of track time, Vettel finished as fifth quickest, although the German was not too happy with his day.
"I felt a vibration during the second session, so stopped the car as it didn't look very good," said Vettel. "We didn't know what the exact problem was, but when we got the car back it turned out it was the engine. We made some changes to the car between the two practice sessions, which meant we were a few minutes late starting the second practice.
"It wouldn't have been a problem but then, as it turned out, I was only able to complete three laps in the afternoon due to the vibration in the car."
Teammate Mark Webber had a more productive day, covering 70 laps on his way to the ninth-quickest time.
"It's not the easiest circuit in the world to stay on the track – a few people were having excursions here and there, but being dusty off line, it's very easy to run out of talent here," he said. "It was a pretty good day for us and we've got lots of information to go through tonight. As usual we did the tire comparison.
"Turn 8's a special corner here, very unique, but there are many other corners out there too that we have to get right. We're looking forward to trying to stay on the track tomorrow and on Sunday."