The FIA has found "no evidence" to suggest McLaren breached the regulations following allegations it had used water to cool its tyres during grands prix.
Across the Sao Paulo GP weekend, it was claimed Red Bull had asked the FIA to look into the idea McLaren, amongst others, was using water in the tyres to dissipate heat, making Pirelli's rubber last longer.
The claim was the latest in a series of technical complaints which have been made this season, which also saw McLaren's low-downforce flexi-wing in Azerbaijan investigated by the FIA.
Motorsport's governing body has also thoroughly looked into a ride-height adjustment device on Red Bull's RB20 that drew scrutiny ahead of the recent United States Grand Prix. It has now delivered its findings on that particular matter.
In Brazil, Pirelli motorsport director Mario Isola said over the weekend, "I cannot see anything strange from the data we have, so I don't have any evidence. Obviously, it is up to the FIA to decide what to do and tell us where we can [offer] support."
In tandem with the investigation into Red Bull's bib-adjuster device, the FIA has also looked into the tyre accusations.
It is comfortable that no team is breaching the regulations. A statement read: "The FIA investigated during the last grand prix in Brazil recent allegations that competitors may have used water to manage overheating of tyres.
"No evidence was found to suggest any irregular behaviour."
The FIA considers both that, and the Red Bull matter "closed". However, it "will continue to monitor the situation in detail".
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