Red Bull admits to have made a mistake with the permitted temperature of its fuel ahead of the team's one-two finish in Barcelona.
"Of course I don't know what was going on there," said Ferrari team boss Binotto.
"But I can imagine that it had something to do with the fuel temperatures in the tank, which can be a maximum of ten degrees below the ambient temperature."
The Italian suspects that simply running the engines with too-cold fuel was technically a rules breach.
"I think the rules should be followed at all times during a race weekend," said Binotto. "Not just when the car goes out on the track, but also in the box."
Dr Helmut Marko, a top Red Bull official, admits the championship leaders simply made a mistake.
"We had overlooked that the temperature had changed," he explained. "But we noticed it in time and let the engine run to warm up the petrol."
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