WATCH: Engine worries for Leclerc after smoky exit from FP3

Charles Leclerc's final practice session for the 2019 United States Grand Prix lasted barely 15 minutes, his Ferrari coming to a smoky halt out on track in Austin.

His team subsequently found an oil leak, opting to make a power unit swap ahead of qualifying. As the change is to a previously-used unit, there will be no grid penalty for Leclerc.