This time, Mercedes racing team director Toto Wolff has added his name to the list of skeptics about Red Bull's mysterious equipment that adjusts ground clearance.
Ahead of the US Grand Prix on Monday, it was reported that Red Bull - a racing team based in Milton Keynes, had equipped a strange part for their car, which could change the ground clearance first.
Although there is no clear evidence, it has been accused that the team used the tool to make illegal adjustments to the previous ground clearance between the qualifying round and the main round - a time when teams are not allowed to edit their cars.
Red Bull team director Christian Horner and FIA one-seat chief Nikolas Tombazis both firmly denied it, saying it had happened at a previous race.
This mechanism has also been demonstrated to the FIA before the Austin time trial to make no doubt.
However, this is not enough to ease concerns in the F1 world.
Zak Brown, McLaren's team director, was particularly outspoken in criticizing the "bib" device - questioning its purpose and discreet location in the car's footrest.
In a statement, Red Bull denied the allegations of carrying out unauthorized work. The unit "cannot be approached when the vehicle is fully assembled and ready to operate," they said.
However, Brown stressed that under the state of parc ferme when no work is allowed on the vehicle the vehicle can still be dismantled.
Speaking after the US GP, Wolff called this cheating behavior "unreasonable".
"My point of view, from what I have seen and heard, is unreasonable," he said.
"I think we all design parts according to Formula 1 standards, which meet the highest requirements. We design the parts within the framework of regulations.
Sometimes with things like aerodynamics, you might try to go as far as you can, but there are parts where you have to question why they exist.
Brown also called on the team members to provide an oath confirming that the device had never operated under parc ferme conditions.
"I would like to see senior management, former chief mechanics and current mechanics sign an oath stating that they have never used or are not aware of the use of the device," Brown told the Daily Mail.
"Some have suggested that it was used that way, so the only way to find out the cause is to ' Say here' in the old way, stating what happened.
I am sure that this problem will be solved in the future. But if they have done it in the past, there are no rules on this. things like changing your car in parc ferme are clearly a violation of the rules.
According to Red Bull, this part has been in its current position for the past 3 years.
However, it was only discovered outside after reviewing the team's open-source components, which were provided to competitors on the FIA server.
In the same statement, Red Bull said that a new process for sealing devices when in parc ferme conditions will be introduced.
"We have agreed a plan for the future," the statement read.
