Mercedes and Lewis Hamilton are not concerned by the engine issue that limited his running during second practice for the Austrian Grand Prix.
Hamilton set a new lap record at the Red Bull Ring during the afternoon session but had to stop midway through his race preparation to allow his team to change a spark plug on his engine. He lost 20 minutes while the mechanics worked on the car but still returned to the track with the same problem.
Yet Mercedes is not concerned about the issue as Hamilton was using an old power unit on Friday -- the one used at the first four races of the season -- and it was already scheduled to be swapped out for a newer one ahead of qualifying.