Robert Kubica is predicting a "lottery" at the Brazilian Grand Prix, as the weather looks set to play a key role during the weekend.
Last year's event was affected by rain, and the Renault driver reckons the situation is likely to be repeated this season.
That is why the Pole is refusing to make any predictions for the weekend.
"Brazil is a bit of a strange track and it's really difficult to predict how we will perform," said Kubica in a team preview.
"There is a long straight out of the last corner where the F-duct will give us lots of gain and this is also where the power of the engine will be important.
"I think that we might have a lottery with the weather because Brazil gets unsettled conditions at this time of year, so it's likely we will have some wet running, as we did in 2009.
"When it rains the track has very poor grip and you have to be lucky to get the perfect balance with the car."
He added: "I had a good result there last year, which came as a big surprise. It will be difficult to repeat it this year, but as I said the weather can play a big role at Interlagos and anything can happen there."
Teammate Vitaly Petrov is looking to enjoy a trouble-free weekend in Brazil after having crashed out of the last two races in Japan and Korea.
"When you have tough races like Japan and Korea, you can't wait to get back in the car to forget those bad memories, so I'm really looking forward to Interlagos," he said. "But it's difficult to know what to expect because I've never been to Brazil before and it's another new challenge for me.
"It's a famous circuit because there have been so many great races there, especially in the last few years with the championship being decided. I remember watching these races on television so it will be great to experience it for real."