It has been revealed that Honda had to fit a new engine to Max Verstappen's Red Bull after the car had issues with an oil leak during FP1. The team has said that they are not too worried about the issue but hope that the replacement has fixed the issue and will start investigating what caused the leak.
"We've now changed the power unit on Max's car following the oil leak that occurred during FP1," said Honda F1 boss Toyoharu Tanabe to GPToday.net.
"Both cars started FP1 with Spec 1 PUs with a plan of changing them for Spec 2 tonight, therefore Max's PU change has happened just one session earlier than planned.
"Pierre continues to use the spec 1 PU for FP2 and his PU will be switched to Spec 2 tonight, as per the original plan. Further investigation on the cause of the oil leak will now be carried out."
So far this season the Honda engine has been very reliable and they will be desperate to ensure that this is not a recurring problem.