Chinese GP practice quotes: Sauber

Esteban Gutierrez - 18th/13th: "Generally the sessions were positive and helped us to understand what our issues are and to find a step forward. This is something that keeps us going and pointing us in the right direction. I think there is still a lot of room for improvement. Unfortunately, at the end of the second session we had an oil leak, which, of course, is not what you want to have. However it is good it happened now and not later in the weekend, so hopefully we will have two trouble-free days from now on."

Tom McCullough, Head of Track Engineering: "We evaluated some aerodynamic parts, including a modified rear wing and some other small parts, and they seem to be working as we hoped they would. Unfortunately, with Esteban we had an oil leak on his car cutting short FP2 by 20 minutes. Nico had traffic on his lap with the soft tyres, but overall the drivers are reasonably happy with the car. We've got plenty of data to look at as we prepare for qualifying and the race."