Bernie Ecclestone has sensationally claimed that Italian constructors Ferrari have been awarded 'help' to win races in the past.
Ferrari have not won the Constructors' Championship since 2008, Felipe Massa agonisingly missed out on a title win at the Brazil Grand Prix that year, but Lewis Hamilton pipped him to the championship by one point.
Since 2008, Mercedes and Red Bull have dominated, clinching eight titles - evenly split between the two teams.
Ferrari have been in better form this campaign, with Sebastian Vettel leading the F1 standings until last month.
The Italian constructor has made progress since a problematic start to the turbo hybrid formula in 2014.
An overhaul at Ferrari has helped lift its performances on the track in the last 12 months, but Ecclestone has asserted that it was helped on the engine front by its main rival.
"Max has often helped Ferrari, and I too wanted them to win. There can be a season won by others, but even the other teams have an interest in challenging a competitive Ferrari. It's one thing to win against Sauber and quite another to win against a red car,” 87-year-old Ecclestone claimed.
"But, certainly at one point they had help with this engine. It's the same for Mercedes as it is for the others – a world championship win against Ferrari is always worth more."
The accusation has emerged after Ferrari were at the centre of controversy at the US Grand Prix last weekend, with Kimi Raikkonen taking Max Verstappen's third position on the podium.
Judge Garry Connelly penalised the Dutchman for having four wheels off of the track when overtaking the Finnish Ferrari driver on the 16th.
Verstappen received a five-second post-race penalty and described Connelly as 'one idiot judge'.
Ecclestone continued: “If Mercedes decided to transfer technology to Maranello, I say it was a good move.
“F1 is Ferrari, and Ferrari is F1. Helping Ferrari has always been the smartest thing to do. It was always done through the technical regulations.
"The teams are important to F1, but Ferrari is more than that. So many things have been done over the years that have helped Ferrari to win.”
Ecclestone went on to say that other constructors like Honda have employed similar tactics of intra-team assistance with engine technology in the past.
Ferrari's Sebastian Vettel qualified for tomorrow's Mexico Grand Prix in pole position, with Kimi Raikkonen in fifth.
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