Nico and Lewis finished today's practice sessions at a wet Interlagos circuit in P1 and P5 respectively.
"That was an interesting day which could well be relevant for the rest of the weekend - certainly for tomorrow and perhaps even for Sunday. The balance of the car wasn't too bad on either the intermediate or the full wet tyres but, in common with our rivals, we don't have any data on how it will be in dry conditions," said Ross. "Overall, it was a useful and straightforward day in the context of preparations for the possibility of a wet qualifying session or race."
The drivers completed a total of just 48 laps today, just over half a race distance, in wet conditions at Interlagos. With further rain forecast, the priority was to save sets of fresh wet tyres for sessions later in the weekend.
"We had two decent sessions today, which further confirmed the tendency already seen this season that our car performs well in mixed conditions," said Toto. "However, the forecast is so inconsistent that we need to ensure we have the right compromise for both wet and dry as we cannot assume it will be a wet race. So we will be working hard overnight to make sure we are in good shape whatever the weather."
In the past, the Brazilian Grand Prix has always been known for its changeable weather and action-packed racing.