Ferrari's worrying start to the 2012 pre-season got a boost on Friday when Fernando Alonso topped the times in the famous team's new car.

Earlier, when Red Bull's Dietrich Mateschitz was in the paddock, he wondered to Blick newspaper: "What's up with Ferrari?"

Former Ferrari driver Mika Salo answered: "They're having problems at every corner."

But although not as quick as the impressive Lotus earlier this week, Spaniard Alonso was faster than all comers on the last of the four-day session at Jerez, including Red Bull's Sebastian Vettel who had technical problems.

Typically, Alonso was giving nothing away.

"This time is worth nothing as is the one I set yesterday and those of the previous days," he said.

He was also not getting excited about Lotus' potential title challenge.

"I don't know as even for them it's a bit early and I would rather just say I am very happy to see Kimi (Raikkonen) back.

"He's a great driver and a great person," said Alonso.